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< p class = "caption" role = "heading" > < span class = "caption-text" > Introduction< / span > < / p >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../../content/basic_usage/" > Basic Usage< / a > < / li >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../spaces/" > Spaces< / a > < input class = "toctree-checkbox" id = "toctree-checkbox-1" name = "toctree-checkbox-1" role = "switch" type = "checkbox" / > < label for = "toctree-checkbox-1" > < div class = "visually-hidden" > Toggle child pages in navigation< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../spaces/utils/" > Spaces Utils< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../wrappers/" > Wrappers< / a > < / li >
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< li class = "toctree-l1 current current-page" > < a class = "current reference internal" href = "#" > Utils< / a > < / li >
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< p class = "caption" role = "heading" > < span class = "caption-text" > Environments< / span > < / p >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../environments/atari/" > Atari< / a > < input class = "toctree-checkbox" id = "toctree-checkbox-2" name = "toctree-checkbox-2" role = "switch" type = "checkbox" / > < label for = "toctree-checkbox-2" > < div class = "visually-hidden" > Toggle child pages in navigation< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/adventure/" > Adventure< / a > < / li >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/double_dunk/" > Double Dunk< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/elevator_action/" > Elevator Action< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/enduro/" > Enduro< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/fishing_derby/" > FishingDerby< / a > < / li >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/pooyan/" > Pooyan< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/private_eye/" > PrivateEye< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/qbert/" > Qbert< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/riverraid/" > Riverraid< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/road_runner/" > Road Runner< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/robotank/" > Robot Tank< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/seaquest/" > Seaquest< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/skiing/" > Skiings< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/solaris/" > Solaris< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/space_invaders/" > SpaceInvaders< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/star_gunner/" > StarGunner< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/tennis/" > Tennis< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/time_pilot/" > TimePilot< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/tutankham/" > Tutankham< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/up_n_down/" > Up n’ < / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/venture/" > Venture< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/video_pinball/" > Video Pinball< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/wizard_of_wor/" > Wizard of Wor< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/atari/zaxxon/" > Zaxxon< / a > < / li >
< / ul >
< / li >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../environments/mujoco/" > MuJoCo< / a > < input class = "toctree-checkbox" id = "toctree-checkbox-3" name = "toctree-checkbox-3" role = "switch" type = "checkbox" / > < label for = "toctree-checkbox-3" > < div class = "visually-hidden" > Toggle child pages in navigation< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/mujoco/ant/" > Ant< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/mujoco/half_cheetah/" > Half Cheetah< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/mujoco/hopper/" > Hopper< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/mujoco/humanoid_standup/" > Humanoid Standup< / a > < / li >
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< / ul >
< / li >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../environments/toy_text/" > Toy Text< / a > < input class = "toctree-checkbox" id = "toctree-checkbox-4" name = "toctree-checkbox-4" role = "switch" type = "checkbox" / > < label for = "toctree-checkbox-4" > < div class = "visually-hidden" > Toggle child pages in navigation< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/toy_text/blackjack/" > Blackjack< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/toy_text/taxi/" > Taxi< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/toy_text/cliff_walking/" > Cliff Walking< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/toy_text/frozen_lake/" > Frozen Lake< / a > < / li >
< / ul >
< / li >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../environments/classic_control/" > Classic Control< / a > < input class = "toctree-checkbox" id = "toctree-checkbox-5" name = "toctree-checkbox-5" role = "switch" type = "checkbox" / > < label for = "toctree-checkbox-5" > < div class = "visually-hidden" > Toggle child pages in navigation< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/classic_control/acrobot/" > Acrobot< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/classic_control/cart_pole/" > Cart Pole< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/classic_control/mountain_car_continuous/" > Mountain Car Continuous< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/classic_control/mountain_car/" > Mountain Car< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/classic_control/pendulum/" > Pendulum< / a > < / li >
< / ul >
< / li >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../environments/box2d/" > Box2D< / a > < input class = "toctree-checkbox" id = "toctree-checkbox-6" name = "toctree-checkbox-6" role = "switch" type = "checkbox" / > < label for = "toctree-checkbox-6" > < div class = "visually-hidden" > Toggle child pages in navigation< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/box2d/bipedal_walker/" > Bipedal Walker< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/box2d/car_racing/" > Car Racing< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../environments/box2d/lunar_lander/" > Lunar Lander< / a > < / li >
< / ul >
< / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../environments/third_party_environments/" > Third Party Environments< / a > < / li >
< / ul >
< p class = "caption" role = "heading" > < span class = "caption-text" > Tutorials< / span > < / p >
< ul >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../content/environment_creation/" > Make your own custom environment< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../content/vectorising/" > Vectorising your environments< / a > < / li >
< / ul >
< p class = "caption" role = "heading" > < span class = "caption-text" > Development< / span > < / p >
< ul >
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< li class = "toctree-l1" > < a class = "reference external" href = "https://github.com/Farama-Foundation/Gymnasium" > Github< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference external" href = "https://farama.org/donations" > Donate< / a > < / li >
< / ul >
< / div >
< / div >
< / div >
< / div >
< / aside >
< div class = "main" >
< div class = "content" >
< div class = "article-container" >
< a href = "#" class = "back-to-top muted-link" >
< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" >
< path d = "M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8v12z" > < / path >
< / svg >
< span > Back to top< / span >
< / a >
< div class = "content-icon-container" >
< div class = "theme-toggle-container theme-toggle-content" >
< button class = "theme-toggle" >
< div class = "visually-hidden" > Toggle Light / Dark / Auto color theme< / div >
< svg class = "theme-icon-when-auto" > < use href = "#svg-sun-half" > < / use > < / svg >
< svg class = "theme-icon-when-dark" > < use href = "#svg-moon" > < / use > < / svg >
< svg class = "theme-icon-when-light" > < use href = "#svg-sun" > < / use > < / svg >
< / button >
< / div >
< label class = "toc-overlay-icon toc-content-icon" for = "__toc" >
< div class = "visually-hidden" > Toggle table of contents sidebar< / div >
< i class = "icon" > < svg > < use href = "#svg-toc" > < / use > < / svg > < / i >
< / label >
< / div >
< article role = "main" >
< section id = "utils" >
< h1 > Utils< a class = "headerlink" href = "#utils" title = "Permalink to this heading" > #< / a > < / h1 >
< section id = "visualization" >
< h2 > Visualization< a class = "headerlink" href = "#visualization" title = "Permalink to this heading" > #< / a > < / h2 >
< dl class = "py class" >
< dt class = "sig sig-object py" id = "gymnasium.utils.play.PlayableGame" >
< em class = "property" > < span class = "pre" > class< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.play.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > PlayableGame< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > keys_to_action< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Dict< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "p" > < span class = "pre" > ...< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > zoom< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.play.PlayableGame" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Wraps an environment allowing keyboard inputs to interact with the environment.< / p >
< p > Wraps an environment with a dictionary of keyboard buttons to action and if to zoom in on the environment.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > env< / strong > – < / p > < / li >
< li > < p > < strong > keys_to_action< / strong > – < / p > < / li >
< li > < p > < strong > zoom< / strong > – < / p > < / li >
< / ul >
< / dd >
< / dl >
< dl class = "py method" >
< dt class = "sig sig-object py" id = "gymnasium.utils.play.PlayableGame.process_event" >
< span class = "sig-name descname" > < span class = "pre" > process_event< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > event< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Event< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.play.PlayableGame.process_event" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Processes a PyGame event.< / p >
< p > In particular, this function is used to keep track of which buttons are currently pressed
and to exit the < a class = "reference internal" href = "#gymnasium.utils.play.play" title = "gymnasium.utils.play.play" > < code class = "xref py py-func docutils literal notranslate" > < span class = "pre" > play()< / span > < / code > < / a > function when the PyGame window is closed.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > event< / strong > – < / p >
< / dd >
< / dl >
< / dd > < / dl >
< / dd > < / dl >
< dl class = "py class" >
< dt class = "sig sig-object py" id = "gymnasium.utils.play.PlayPlot" >
< em class = "property" > < span class = "pre" > class< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.play.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > PlayPlot< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > callback< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > callable< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > horizon_timesteps< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > int< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > plot_names< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > List< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > str< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.play.PlayPlot" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Provides a callback to create live plots of arbitrary metrics when using < a class = "reference internal" href = "#gymnasium.utils.play.play" title = "gymnasium.utils.play.play" > < code class = "xref py py-func docutils literal notranslate" > < span class = "pre" > play()< / span > < / code > < / a > .< / p >
< dl class = "simple" >
< dt > This class is instantiated with a function that accepts information about a single environment transition:< / dt > < dd > < ul class = "simple" >
< li > < p > obs_t: observation before performing action< / p > < / li >
< li > < p > obs_tp1: observation after performing action< / p > < / li >
< li > < p > action: action that was executed< / p > < / li >
< li > < p > rew: reward that was received< / p > < / li >
< li > < p > terminated: whether the environment is terminated or not< / p > < / li >
< li > < p > truncated: whether the environment is truncated or not< / p > < / li >
< li > < p > info: debug info< / p > < / li >
< / ul >
< / dd >
< / dl >
< p > It should return a list of metrics that are computed from this data.
For instance, the function may look like this:< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "k" > def< / span > < span class = "nf" > compute_metrics< / span > < span class = "p" > (< / span > < span class = "n" > obs_t< / span > < span class = "p" > ,< / span > < span class = "n" > obs_tp< / span > < span class = "p" > ,< / span > < span class = "n" > action< / span > < span class = "p" > ,< / span > < span class = "n" > reward< / span > < span class = "p" > ,< / span > < span class = "n" > terminated< / span > < span class = "p" > ,< / span > < span class = "n" > truncated< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "p" > ):< / span >
< span class = "gp" > ... < / span > < span class = "k" > return< / span > < span class = "p" > [< / span > < span class = "n" > reward< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "p" > [< / span > < span class = "s2" > " cumulative_reward" < / span > < span class = "p" > ],< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > linalg< / span > < span class = "o" > .< / span > < span class = "n" > norm< / span > < span class = "p" > (< / span > < span class = "n" > action< / span > < span class = "p" > )]< / span >
< / pre > < / div >
< / div >
< p > < a class = "reference internal" href = "#gymnasium.utils.play.PlayPlot" title = "gymnasium.utils.play.PlayPlot" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > PlayPlot< / span > < / code > < / a > provides the method < a class = "reference internal" href = "#gymnasium.utils.play.PlayPlot.callback" title = "gymnasium.utils.play.PlayPlot.callback" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > callback()< / span > < / code > < / a > which will pass its arguments along to that function
and uses the returned values to update live plots of the metrics.< / p >
< p > Typically, this < a class = "reference internal" href = "#gymnasium.utils.play.PlayPlot.callback" title = "gymnasium.utils.play.PlayPlot.callback" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > callback()< / span > < / code > < / a > will be used in conjunction with < a class = "reference internal" href = "#gymnasium.utils.play.play" title = "gymnasium.utils.play.play" > < code class = "xref py py-func docutils literal notranslate" > < span class = "pre" > play()< / span > < / code > < / a > to see how the metrics evolve as you play:< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "n" > plotter< / span > < span class = "o" > =< / span > < span class = "n" > PlayPlot< / span > < span class = "p" > (< / span > < span class = "n" > compute_metrics< / span > < span class = "p" > ,< / span > < span class = "n" > horizon_timesteps< / span > < span class = "o" > =< / span > < span class = "mi" > 200< / span > < span class = "p" > ,< / span >
< span class = "gp" > ... < / span > < span class = "n" > plot_names< / span > < span class = "o" > =< / span > < span class = "p" > [< / span > < span class = "s2" > " Immediate Rew." < / span > < span class = "p" > ,< / span > < span class = "s2" > " Cumulative Rew." < / span > < span class = "p" > ,< / span > < span class = "s2" > " Action Magnitude" < / span > < span class = "p" > ])< / span >
< span class = "gp" > > > > < / span > < span class = "n" > play< / span > < span class = "p" > (< / span > < span class = "n" > your_env< / span > < span class = "p" > ,< / span > < span class = "n" > callback< / span > < span class = "o" > =< / span > < span class = "n" > plotter< / span > < span class = "o" > .< / span > < span class = "n" > callback< / span > < span class = "p" > )< / span >
< / pre > < / div >
< / div >
< p > Constructor of < a class = "reference internal" href = "#gymnasium.utils.play.PlayPlot" title = "gymnasium.utils.play.PlayPlot" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > PlayPlot< / span > < / code > < / a > .< / p >
< p > The function < code class = "docutils literal notranslate" > < span class = "pre" > callback< / span > < / code > that is passed to this constructor should return
a list of metrics that is of length < code class = "docutils literal notranslate" > < span class = "pre" > len(plot_names)< / span > < / code > .< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > callback< / strong > – < / p > < / li >
< li > < p > < strong > horizon_timesteps< / strong > – < / p > < / li >
< li > < p > < strong > plot_names< / strong > – < / p > < / li >
< / ul >
< / dd >
< dt class = "field-even" > Raises< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > DependencyNotInstalled< / strong > – < / p >
< / dd >
< / dl >
< dl class = "py method" >
< dt class = "sig sig-object py" id = "gymnasium.utils.play.PlayPlot.callback" >
< span class = "sig-name descname" > < span class = "pre" > callback< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > obs_t< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > ObsType< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > obs_tp1< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > ObsType< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > action< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > ActType< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > rew< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > float< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > terminated< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > bool< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > truncated< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > bool< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > info< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > dict< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.play.PlayPlot.callback" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > The callback that calls the provided data callback and adds the data to the plots.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > obs_t< / strong > – < / p > < / li >
< li > < p > < strong > obs_tp1< / strong > – < / p > < / li >
< li > < p > < strong > action< / strong > – < / p > < / li >
< li > < p > < strong > rew< / strong > – < / p > < / li >
< li > < p > < strong > terminated< / strong > – < / p > < / li >
< li > < p > < strong > truncated< / strong > – < / p > < / li >
< li > < p > < strong > info< / strong > – < / p > < / li >
< / ul >
< / dd >
< / dl >
< / dd > < / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.play.display_arr" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.play.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > display_arr< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > screen< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Surface< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > arr< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > ndarray< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > video_size< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > transpose< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > bool< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.play.display_arr" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Displays a numpy array on screen.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > screen< / strong > – < / p > < / li >
< li > < p > < strong > arr< / strong > – < / p > < / li >
< li > < p > < strong > video_size< / strong > – < / p > < / li >
< li > < p > < strong > transpose< / strong > – < / p > < / li >
< / ul >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.play.play" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.play.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > play< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > transpose< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > True< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > fps< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > zoom< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > callback< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Callable< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > keys_to_action< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Dict< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > str< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > str< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ActType< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > seed< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" >
< dd > < p > Allows one to play the game using keyboard.< / p >
< p > Example:< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "kn" > import< / span > < span class = "nn" > gymnasium< / span >
< span class = "gp" > > > > < / span > < span class = "kn" > from< / span > < span class = "nn" > gymnasium.utils.play< / span > < span class = "kn" > import< / span > < span class = "n" > play< / span >
< span class = "gp" > > > > < / span > < span class = "n" > play< / span > < span class = "p" > (< / span > < span class = "n" > gymnasium< / span > < span class = "o" > .< / span > < span class = "n" > make< / span > < span class = "p" > (< / span > < span class = "s2" > " CarRacing-v1" < / span > < span class = "p" > ,< / span > < span class = "n" > render_mode< / span > < span class = "o" > =< / span > < span class = "s2" > " rgb_array" < / span > < span class = "p" > ),< / span > < span class = "n" > keys_to_action< / span > < span class = "o" > =< / span > < span class = "p" > {< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " w" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mf" > 0.7< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " a" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "o" > -< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " s" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 1< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " d" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " wa" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "o" > -< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mf" > 0.7< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " dw" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mf" > 0.7< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " ds" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 1< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " as" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "o" > -< / span > < span class = "mi" > 1< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 1< / span > < span class = "p" > ]),< / span >
< span class = "gp" > ... < / span > < span class = "p" > },< / span > < span class = "n" > noop< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > array< / span > < span class = "p" > ([< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ]))< / span >
< / pre > < / div >
< / div >
< p > Above code works also if the environment is wrapped, so it’
verifying that the frame-level preprocessing does not render the game
unplayable.< / p >
< p > If you wish to plot real time statistics as you play, you can use
< code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gym.utils.play.PlayPlot< / span > < / code > . Here’
for last 150 steps.< / p >
< div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "k" > def< / span > < span class = "nf" > callback< / span > < span class = "p" > (< / span > < span class = "n" > obs_t< / span > < span class = "p" > ,< / span > < span class = "n" > obs_tp1< / span > < span class = "p" > ,< / span > < span class = "n" > action< / span > < span class = "p" > ,< / span > < span class = "n" > rew< / span > < span class = "p" > ,< / span > < span class = "n" > terminated< / span > < span class = "p" > ,< / span > < span class = "n" > truncated< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "p" > ):< / span >
< span class = "gp" > ... < / span > < span class = "k" > return< / span > < span class = "p" > [< / span > < span class = "n" > rew< / span > < span class = "p" > ,]< / span >
< span class = "gp" > > > > < / span > < span class = "n" > plotter< / span > < span class = "o" > =< / span > < span class = "n" > PlayPlot< / span > < span class = "p" > (< / span > < span class = "n" > callback< / span > < span class = "p" > ,< / span > < span class = "mi" > 150< / span > < span class = "p" > ,< / span > < span class = "p" > [< / span > < span class = "s2" > " reward" < / span > < span class = "p" > ])< / span >
< span class = "gp" > > > > < / span > < span class = "n" > play< / span > < span class = "p" > (< / span > < span class = "n" > gymnasium< / span > < span class = "o" > .< / span > < span class = "n" > make< / span > < span class = "p" > (< / span > < span class = "s2" > " ALE/AirRaid-v5" < / span > < span class = "p" > ),< / span > < span class = "n" > callback< / span > < span class = "o" > =< / span > < span class = "n" > plotter< / span > < span class = "o" > .< / span > < span class = "n" > callback< / span > < span class = "p" > )< / span >
< / pre > < / div >
< / div >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > env< / strong > – < / p > < / li >
< li > < p > < strong > transpose< / strong > – < code class = "docutils literal notranslate" > < span class = "pre" > True< / span > < / code > , the output of observation is transposed. Defaults to < code class = "docutils literal notranslate" > < span class = "pre" > True< / span > < / code > .< / p > < / li >
< li > < p > < strong > fps< / strong > – < code class = "docutils literal notranslate" > < span class = "pre" > None< / span > < / code > (the default),
< code class = "docutils literal notranslate" > < span class = "pre" > env.metadata[" render_fps" " ]< / span > < / code > (or 30, if the environment does not specify “render_fps”) is used.< / p > < / li >
< li > < p > < strong > zoom< / strong > – < code class = "docutils literal notranslate" > < span class = "pre" > zoom< / span > < / code > amount, should be positive float< / p > < / li >
< li > < p > < strong > callback< / strong > –
obs_t: observation before performing action
obs_tp1: observation after performing action
action: action that was executed
rew: reward that was received
terminated: whether the environment is terminated or not
truncated: whether the environment is truncated or not
info: debug info< / p > < / li >
< li > < p > < strong > keys_to_action< / strong > – < p > Mapping from keys pressed to action performed.
Different formats are supported: Key combinations can either be expressed as a tuple of unicode code
points of the keys, as a tuple of characters, or as a string where each character of the string represents
one key.
For example if pressing ‘ ’
to trigger action number 2 then < code class = "docutils literal notranslate" > < span class = "pre" > key_to_action< / span > < / code > dict could look like this:< / p >
< div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "p" > {< / span >
< span class = "gp" > ... < / span > < span class = "c1" > # ...< / span >
< span class = "gp" > ... < / span > < span class = "p" > (< / span > < span class = "nb" > ord< / span > < span class = "p" > (< / span > < span class = "s1" > ' w' < / span > < span class = "p" > ),< / span > < span class = "nb" > ord< / span > < span class = "p" > (< / span > < span class = "s1" > ' ' < / span > < span class = "p" > )):< / span > < span class = "mi" > 2< / span >
< span class = "gp" > ... < / span > < span class = "c1" > # ...< / span >
< span class = "gp" > ... < / span > < span class = "p" > }< / span >
< / pre > < / div >
< / div >
< dl >
< dt > or like this:< / dt > < dd > < div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "p" > {< / span >
< span class = "gp" > ... < / span > < span class = "c1" > # ...< / span >
< span class = "gp" > ... < / span > < span class = "p" > (< / span > < span class = "s2" > " w" < / span > < span class = "p" > ,< / span > < span class = "s2" > " " < / span > < span class = "p" > ):< / span > < span class = "mi" > 2< / span >
< span class = "gp" > ... < / span > < span class = "c1" > # ...< / span >
< span class = "gp" > ... < / span > < span class = "p" > }< / span >
< / pre > < / div >
< / div >
< / dd >
< dt > or like this:< / dt > < dd > < div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "p" > {< / span >
< span class = "gp" > ... < / span > < span class = "c1" > # ...< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " w " < / span > < span class = "p" > :< / span > < span class = "mi" > 2< / span >
< span class = "gp" > ... < / span > < span class = "c1" > # ...< / span >
< span class = "gp" > ... < / span > < span class = "p" > }< / span >
< / pre > < / div >
< / div >
< / dd >
< / dl >
< p > If < code class = "docutils literal notranslate" > < span class = "pre" > None< / span > < / code > , default < code class = "docutils literal notranslate" > < span class = "pre" > key_to_action< / span > < / code > mapping for that environment is used, if provided.< / p >
< / p > < / li >
< li > < p > < strong > seed< / strong > – < / p > < / li >
< li > < p > < strong > noop< / strong > – < / p > < / li >
< / ul >
< / dd >
< / dl >
< / dd > < / dl >
< / section >
< section id = "save-rendering-videos" >
< h2 > Save Rendering Videos< a class = "headerlink" href = "#save-rendering-videos" title = "Permalink to this heading" > #< / a > < / h2 >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.save_video.capped_cubic_video_schedule" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.save_video.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > capped_cubic_video_schedule< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > episode_id< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > int< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < span class = "sig-return" > < span class = "sig-return-icon" > → < / span > < span class = "sig-return-typehint" > < span class = "pre" > bool< / span > < / span > < / span > < a class = "headerlink" href = "#gymnasium.utils.save_video.capped_cubic_video_schedule" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > The default episode trigger.< / p >
< p > This function will trigger recordings at the episode indices 0, 1, 4, 8, 27, …, < span class = "math notranslate nohighlight" > \(k^3\)< / span > , …, 729, 1000, 2000, 3000, …< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > episode_id< / strong > – < / p >
< / dd >
< dt class = "field-even" > Returns< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > If to apply a video schedule number< / strong > < / p >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.save_video.save_video" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.save_video.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > save_video< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > frames< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > list< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > video_folder< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > str< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > episode_trigger< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Callable< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > step_trigger< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Callable< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > video_length< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > name_prefix< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > str< / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > 'rl-video'< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > episode_index< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > int< / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > 0< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > step_starting_index< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > int< / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > 0< / span > < / span > < / em > , < em class = "sig-param" > < span class = "o" > < span class = "pre" > **< / span > < / span > < span class = "n" > < span class = "pre" > kwargs< / span > < / span > < / em > < span class = "sig-paren" > )< /sp
< dd > < p > Save videos from rendering frames.< / p >
< p > This function extract video from a list of render frame episodes.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > frames< / strong > (< em > List< / em > < em > [< / em > < em > RenderFrame< / em > < em > ]< / em > ) – < / p > < / li >
< li > < p > < strong > video_folder< / strong > (< em > str< / em > ) – < / p > < / li >
< li > < p > < strong > episode_trigger< / strong > – < code class = "docutils literal notranslate" > < span class = "pre" > True< / span > < / code > iff a recording should be started at this episode< / p > < / li >
< li > < p > < strong > step_trigger< / strong > – < code class = "docutils literal notranslate" > < span class = "pre" > True< / span > < / code > iff a recording should be started at this step< / p > < / li >
< li > < p > < strong > video_length< / strong > (< em > int< / em > ) – ’
Otherwise, snippets of the specified length are captured.< / p > < / li >
< li > < p > < strong > name_prefix< / strong > (< em > str< / em > ) – < / p > < / li >
< li > < p > < strong > episode_index< / strong > (< em > int< / em > ) – < / p > < / li >
< li > < p > < strong > step_starting_index< / strong > (< em > int< / em > ) – < / p > < / li >
< li > < p > < strong > **kwargs< / strong > – ’
You need to specify either fps or duration.< / p > < / li >
< / ul >
< / dd >
< / dl >
< p class = "rubric" > Example< / p >
< div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "kn" > import< / span > < span class = "nn" > gymnasium< / span >
< span class = "gp" > > > > < / span > < span class = "kn" > from< / span > < span class = "nn" > gymnasium.utils.save_video< / span > < span class = "kn" > import< / span > < span class = "n" > save_video< / span >
< span class = "gp" > > > > < / span > < span class = "n" > env< / span > < span class = "o" > =< / span > < span class = "n" > gymnasium< / span > < span class = "o" > .< / span > < span class = "n" > make< / span > < span class = "p" > (< / span > < span class = "s2" > " FrozenLake-v1" < / span > < span class = "p" > ,< / span > < span class = "n" > render_mode< / span > < span class = "o" > =< / span > < span class = "s2" > " rgb_array_list" < / span > < span class = "p" > )< / span >
< span class = "gp" > > > > < / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > reset< / span > < span class = "p" > ()< / span >
< span class = "gp" > > > > < / span > < span class = "n" > step_starting_index< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span >
< span class = "gp" > > > > < / span > < span class = "n" > episode_index< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span >
< span class = "gp" > > > > < / span > < span class = "k" > for< / span > < span class = "n" > step_index< / span > < span class = "ow" > in< / span > < span class = "nb" > range< / span > < span class = "p" > (< / span > < span class = "mi" > 199< / span > < span class = "p" > ):< / span >
< span class = "gp" > ... < / span > < span class = "n" > action< / span > < span class = "o" > =< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > action_space< / span > < span class = "o" > .< / span > < span class = "n" > sample< / span > < span class = "p" > ()< / span >
< span class = "gp" > ... < / span > < span class = "n" > _< / span > < span class = "p" > ,< / span > < span class = "n" > _< / span > < span class = "p" > ,< / span > < span class = "n" > done< / span > < span class = "p" > ,< / span > < span class = "n" > _< / span > < span class = "o" > =< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > step< / span > < span class = "p" > (< / span > < span class = "n" > action< / span > < span class = "p" > )< / span >
< span class = "gp" > ... < / span > < span class = "k" > if< / span > < span class = "n" > done< / span > < span class = "p" > :< / span >
< span class = "gp" > ... < / span > < span class = "n" > save_video< / span > < span class = "p" > (< / span >
< span class = "gp" > ... < / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > render< / span > < span class = "p" > (),< / span >
< span class = "gp" > ... < / span > < span class = "s2" > " videos" < / span > < span class = "p" > ,< / span >
< span class = "gp" > ... < / span > < span class = "n" > fps< / span > < span class = "o" > =< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > metadata< / span > < span class = "p" > [< / span > < span class = "s2" > " render_fps" < / span > < span class = "p" > ],< / span >
< span class = "gp" > ... < / span > < span class = "n" > step_starting_index< / span > < span class = "o" > =< / span > < span class = "n" > step_starting_index< / span > < span class = "p" > ,< / span >
< span class = "gp" > ... < / span > < span class = "n" > episode_index< / span > < span class = "o" > =< / span > < span class = "n" > episode_index< / span >
< span class = "gp" > ... < / span > < span class = "p" > )< / span >
< span class = "gp" > ... < / span > < span class = "n" > step_starting_index< / span > < span class = "o" > =< / span > < span class = "n" > step_index< / span > < span class = "o" > +< / span > < span class = "mi" > 1< / span >
< span class = "gp" > ... < / span > < span class = "n" > episode_index< / span > < span class = "o" > +=< / span > < span class = "mi" > 1< / span >
< span class = "gp" > ... < / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > reset< / span > < span class = "p" > ()< / span >
< span class = "gp" > > > > < / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > close< / span > < span class = "p" > ()< / span >
< / pre > < / div >
< / div >
< / dd > < / dl >
< / section >
< section id = "old-to-new-step-api-compatibility" >
< h2 > Old to New Step API Compatibility< a class = "headerlink" href = "#old-to-new-step-api-compatibility" title = "Permalink to this heading" > #< / a > < / h2 >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.step_api_compatibility.convert_to_terminated_truncated_step_api" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.step_api_compatibility.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > convert_to_terminated_truncated_step_api< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > step_returns< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > ObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > dict< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > list< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > ObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > dict< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > list< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > is_vector_env< / span > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "default_value" > < span class = "pre" > False< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < span class = "sig-return" > < span class = "sig-return-icon" > → < / span > < span class = "sig-return-typeh
< dd > < p > Function to transform step returns to new step API irrespective of input API.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > step_returns< / strong > (< em > tuple< / em > ) – < / p > < / li >
< li > < p > < strong > is_vector_env< / strong > (< em > bool< / em > ) – < / p > < / li >
< / ul >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.step_api_compatibility.convert_to_done_step_api" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.step_api_compatibility.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > convert_to_done_step_api< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > step_returns< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > ObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > dict< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > list< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > ObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > dict< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > list< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > is_vector_env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > bool< / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" >
< dd > < p > Function to transform step returns to old step API irrespective of input API.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > step_returns< / strong > (< em > tuple< / em > ) – < / p > < / li >
< li > < p > < strong > is_vector_env< / strong > (< em > bool< / em > ) – < / p > < / li >
< / ul >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.step_api_compatibility.step_api_compatibility" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.step_api_compatibility.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > step_api_compatibility< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > step_returns< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > ObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > dict< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > list< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > ObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > float< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > ndarray< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Union< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > dict< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > list< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > output_truncation_bool< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > bool< / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class
< dd > < p > Function to transform step returns to the API specified by < cite > output_truncation_bool< / cite > bool.< / p >
< p > Done (old) step API refers to step() method returning (observation, reward, done, info)
Terminated Truncated (new) step API refers to step() method returning (observation, reward, terminated, truncated, info)
(Refer to docs for details on the API change)< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > step_returns< / strong > (< em > tuple< / em > ) – < / p > < / li >
< li > < p > < strong > output_truncation_bool< / strong > (< em > bool< / em > ) – < / p > < / li >
< li > < p > < strong > is_vector_env< / strong > (< em > bool< / em > ) – < / p > < / li >
< / ul >
< / dd >
< dt class = "field-even" > Returns< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > step_returns< / strong > (< em > tuple< / em > ) – < cite > output_truncation_bool< / cite > bool, it can return (obs, rew, done, info) or (obs, rew, terminated, truncated, info)< / p >
< / dd >
< / dl >
< p class = "rubric" > Examples< / p >
< dl class = "simple" >
< dt > This function can be used to ensure compatibility in step interfaces with conflicting API. Eg. if env is written in old API,< / dt > < dd > < p > wrapper is written in new API, and the final step output is desired to be in old API.< / p >
< / dd >
< / dl >
< div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "n" > obs< / span > < span class = "p" > ,< / span > < span class = "n" > rew< / span > < span class = "p" > ,< / span > < span class = "n" > done< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "o" > =< / span > < span class = "n" > step_api_compatibility< / span > < span class = "p" > (< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > step< / span > < span class = "p" > (< / span > < span class = "n" > action< / span > < span class = "p" > ),< / span > < span class = "n" > output_truncation_bool< / span > < span class = "o" > =< / span > < span class = "kc" > False< / span > < span class = "p" > )< / span >
< span class = "gp" > > > > < / span > < span class = "n" > obs< / span > < span class = "p" > ,< / span > < span class = "n" > rew< / span > < span class = "p" > ,< / span > < span class = "n" > terminated< / span > < span class = "p" > ,< / span > < span class = "n" > truncated< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "o" > =< / span > < span class = "n" > step_api_compatibility< / span > < span class = "p" > (< / span > < span class = "n" > env< / span > < span class = "o" > .< / span > < span class = "n" > step< / span > < span class = "p" > (< / span > < span class = "n" > action< / span > < span class = "p" > ),< / span > < span class = "n" > output_truncation_bool< / span > < span class = "o" > =< / span > < span class = "kc" > True< / span > < span class = "p" > )< / span >
< span class = "gp" > > > > < / span > < span class = "n" > observations< / span > < span class = "p" > ,< / span > < span class = "n" > rewards< / span > < span class = "p" > ,< / span > < span class = "n" > dones< / span > < span class = "p" > ,< / span > < span class = "n" > infos< / span > < span class = "o" > =< / span > < span class = "n" > step_api_compatibility< / span > < span class = "p" > (< / span > < span class = "n" > vec_env< / span > < span class = "o" > .< / span > < span class = "n" > step< / span > < span class = "p" > (< / span > < span class = "n" > action< / span > < span class = "p" > ),< / span > < span class = "n" > is_vector_env< / span > < span class = "o" > =< / span > < span class = "kc" > True< / span > < span class = "p" > )< / span >
< / pre > < / div >
< / div >
< / dd > < / dl >
< / section >
< section id = "seeding" >
< h2 > Seeding< a class = "headerlink" href = "#seeding" title = "Permalink to this heading" > #< / a > < / h2 >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.seeding.np_random" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.seeding.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > np_random< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > seed< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > int< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < span class = "sig-return" > < span class = "sig-return-icon" > → < / span > < span class = "sig-return-typehint" > < span class = "pre" > Tuple< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > Generator< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Any< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / span > < a class = "headerlink" href = "#gymnasium.utils.seeding.np_random" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Generates a random number generator from the seed and returns the Generator and seed.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > seed< / strong > – < / p >
< / dd >
< dt class = "field-even" > Returns< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > The generator and resulting seed< / strong > < / p >
< / dd >
< dt class = "field-odd" > Raises< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > Error< / strong > – < / p >
< / dd >
< / dl >
< / dd > < / dl >
< / section >
< section id = "environment-checking" >
< h2 > Environment Checking< a class = "headerlink" href = "#environment-checking" title = "Permalink to this heading" > #< / a > < / h2 >
< section id = "invasive" >
< h3 > Invasive< a class = "headerlink" href = "#invasive" title = "Permalink to this heading" > #< / a > < / h3 >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.check_env" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > check_env< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > warn< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Optional< / span > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > None< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > skip_render_check< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > bool< / span > < / span > < span class = "w" > < / span > < span class = "o" > < span class = "pre" > =< / span > < / span > < span class = "w" > < / span > < span class = "default_value" > < span class = "pre" > False< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.check_env" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Check that an environment follows Gym API.< / p >
< p > This is an invasive function that calls the environment’ < / p >
< p > This is particularly useful when using a custom environment.
2022-09-16 13:02:04 +00:00
Please take a look at < a class = "reference external" href = "https://gymnasium.farama.org/content/environment_creation/" > https://gymnasium.farama.org/content/environment_creation/< / a >
2022-09-13 19:29:14 +00:00
for more information about the API.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > env< / strong > – < / p > < / li >
< li > < p > < strong > warn< / strong > – < / p > < / li >
< li > < p > < strong > skip_render_check< / strong > – < / p > < / li >
< / ul >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.data_equivalence" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > data_equivalence< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > data_1< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > data_2< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < span class = "sig-return" > < span class = "sig-return-icon" > → < / span > < span class = "sig-return-typehint" > < span class = "pre" > bool< / span > < / span > < / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.data_equivalence" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Assert equality between data 1 and 2, i.e observations, actions, info.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < ul class = "simple" >
< li > < p > < strong > data_1< / strong > – < / p > < / li >
< li > < p > < strong > data_2< / strong > – < / p > < / li >
< / ul >
< / dd >
< dt class = "field-even" > Returns< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > If observation 1 and 2 are equivalent< / strong > < / p >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.check_reset_seed" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > check_reset_seed< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.check_reset_seed" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Check that the environment can be reset with a seed.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > env< / strong > – < / p >
< / dd >
< dt class = "field-even" > Raises< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > AssertionError< / strong > –
even though < cite > seed< / cite > or < cite > kwargs< / cite > appear in the signature.< / p >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.check_reset_options" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > check_reset_options< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.check_reset_options" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Check that the environment can be reset with options.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > env< / strong > – < / p >
< / dd >
< dt class = "field-even" > Raises< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > AssertionError< / strong > –
even though < cite > options< / cite > or < cite > kwargs< / cite > appear in the signature.< / p >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.check_reset_return_info_deprecation" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > check_reset_return_info_deprecation< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.check_reset_return_info_deprecation" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Makes sure support for deprecated < cite > return_info< / cite > argument is dropped.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > env< / strong > – < / p >
< / dd >
< dt class = "field-even" > Raises< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > UserWarning< / strong > – < / p >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.check_seed_deprecation" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > check_seed_deprecation< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.check_seed_deprecation" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Makes sure support for deprecated function < cite > seed< / cite > is dropped.< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > env< / strong > – < / p >
< / dd >
< dt class = "field-even" > Raises< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > UserWarning< / strong > – < / p >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.check_reset_return_type" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > check_reset_return_type< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > env< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > Env< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.check_reset_return_type" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Checks that < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > reset()< / span > < / code > correctly returns a tuple of the form < cite > (obs , info)< / cite > .< / p >
< dl class = "field-list simple" >
< dt class = "field-odd" > Parameters< span class = "colon" > :< / span > < / dt >
< dd class = "field-odd" > < p > < strong > env< / strong > – < / p >
< / dd >
< dt class = "field-even" > Raises< span class = "colon" > :< / span > < / dt >
< dd class = "field-even" > < p > < strong > AssertionError depending on spec violation< / strong > – < / p >
< / dd >
< / dl >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.utils.env_checker.check_space_limit" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.utils.env_checker.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > check_space_limit< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > space< / span > < / span > < / em > , < em class = "sig-param" > < span class = "n" > < span class = "pre" > space_type< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > str< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.utils.env_checker.check_space_limit" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Check the space limit for only the Box space as a test that only runs as part of < cite > check_env< / cite > .< / p >
< / dd > < / dl >
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