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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" > < a class = "reference internal" href = "../../content/gym_compatibility/" > Compatibility with Gym< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../../content/migration-guide/" > v21 to v26 Migration Guide< / a > < / li >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../spaces/fundamental/" > Fundamental Spaces< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../spaces/composite/" > Composite Spaces< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../spaces/utils/" > Spaces Utils< / a > < / li >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../spaces/vector_utils/" > Spaces Vector Utils< / a > < / li >
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< li class = "toctree-l1 current has-children current-page" > < a class = "current reference internal" href = "#" > Wrappers< / a > < input checked = "" 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 >
< li class = "toctree-l2" > < a class = "reference internal" href = "misc_wrappers/" > Misc Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "action_wrappers/" > Action Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "observation_wrappers/" > Observation Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "reward_wrappers/" > Reward Wrappers< / a > < / li >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../vector/" > Vector< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../utils/" > Utils< / a > < / li >
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< li class = "toctree-l2" > < a class = "reference internal" href = "../experimental/wrappers/" > Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../experimental/vector/" > Vectorizing Environment< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../experimental/vector_wrappers/" > Vector Environment Wrappers< / a > < / li >
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< section id = "wrappers" >
< h1 > Wrappers< a class = "headerlink" href = "#wrappers" title = "Permalink to this heading" > #< / a > < / h1 >
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< span class = "target" id = "module-gymnasium.wrappers" > < / span > < p > Module of wrapper classes.< / p >
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< p > Wrappers are a convenient way to modify an existing environment without having to alter the underlying code directly.
Using wrappers will allow you to avoid a lot of boilerplate code and make your environment more modular. Wrappers can
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also be chained to combine their effects.
Most environments that are generated via < a class = "reference internal" href = "../registry/#gymnasium.make" title = "gymnasium.make" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > gymnasium.make()< / span > < / code > < / a > will already be wrapped by default.< / p >
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< p > In order to wrap an environment, you must first initialize a base environment. Then you can pass this environment along
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with (possibly optional) parameters to the wrapper’ < / 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 = "k" > as< / span > < span class = "nn" > gym< / span >
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< span class = "gp" > > > > < / span > < span class = "kn" > from< / span > < span class = "nn" > gymnasium.wrappers< / span > < span class = "kn" > import< / span > < span class = "n" > RescaleAction< / span >
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< span class = "gp" > > > > < / span > < span class = "n" > base_env< / span > < span class = "o" > =< / span > < span class = "n" > gym< / span > < span class = "o" > .< / span > < span class = "n" > make< / span > < span class = "p" > (< / span > < span class = "s2" > " BipedalWalker-v3" < / span > < span class = "p" > )< / span >
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< span class = "gp" > > > > < / span > < span class = "n" > base_env< / span > < span class = "o" > .< / span > < span class = "n" > action_space< / span >
< span class = "go" > Box([-1. -1. -1. -1.], [1. 1. 1. 1.], (4,), float32)< / span >
< span class = "gp" > > > > < / span > < span class = "n" > wrapped_env< / span > < span class = "o" > =< / span > < span class = "n" > RescaleAction< / span > < span class = "p" > (< / span > < span class = "n" > base_env< / span > < span class = "p" > ,< / span > < span class = "n" > min_action< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span > < span class = "p" > ,< / span > < span class = "n" > max_action< / span > < span class = "o" > =< / span > < span class = "mi" > 1< / span > < span class = "p" > )< / span >
< span class = "gp" > > > > < / span > < span class = "n" > wrapped_env< / span > < span class = "o" > .< / span > < span class = "n" > action_space< / span >
< span class = "go" > Box([0. 0. 0. 0.], [1. 1. 1. 1.], (4,), float32)< / span >
< / pre > < / div >
< / div >
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< p > You can access the environment underneath the < strong > first< / strong > wrapper by using the < a class = "reference internal" href = "#gymnasium.wrappers.gymnasium.Wrapper.env" title = "gymnasium.wrappers.gymnasium.Wrapper.env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper.env< / span > < / code > < / a > attribute.
As the < a class = "reference internal" href = "#gymnasium.Wrapper" title = "gymnasium.Wrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper< / span > < / code > < / a > class inherits from < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.Env< / span > < / code > < / a > then < a class = "reference internal" href = "#gymnasium.wrappers.gymnasium.Wrapper.env" title = "gymnasium.wrappers.gymnasium.Wrapper.env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper.env< / span > < / code > < / a > can be another wrapper.< / p >
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< div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "n" > wrapped_env< / span >
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< span class = "go" > < RescaleAction< TimeLimit< OrderEnforcing< BipedalWalker< BipedalWalker-v3> > > > > < / span >
< span class = "gp" > > > > < / span > < span class = "n" > wrapped_env< / span > < span class = "o" > .< / span > < span class = "n" > env< / span >
< span class = "go" > < TimeLimit< OrderEnforcing< BipedalWalker< BipedalWalker-v3> > > > < / span >
< / pre > < / div >
< / div >
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< p > If you want to get to the environment underneath < strong > all< / strong > of the layers of wrappers, you can use the
< a class = "reference internal" href = "#gymnasium.Wrapper.unwrapped" title = "gymnasium.Wrapper.unwrapped" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper.unwrapped< / span > < / code > < / a > attribute.
If the environment is already a bare environment, the < a class = "reference internal" href = "#gymnasium.Wrapper.unwrapped" title = "gymnasium.Wrapper.unwrapped" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper.unwrapped< / span > < / code > < / a > attribute will just return itself.< / p >
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< div class = "doctest highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "gp" > > > > < / span > < span class = "n" > wrapped_env< / span >
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< span class = "go" > < RescaleAction< TimeLimit< OrderEnforcing< BipedalWalker< BipedalWalker-v3> > > > > < / span >
< span class = "gp" > > > > < / span > < span class = "n" > wrapped_env< / span > < span class = "o" > .< / span > < span class = "n" > unwrapped< / span >
< span class = "go" > < gymnasium.envs.box2d.bipedal_walker.BipedalWalker object at 0x7f87d70712d0> < / span >
< / pre > < / div >
< / div >
< p > There are three common things you might want a wrapper to do:< / p >
< ul class = "simple" >
< li > < p > Transform actions before applying them to the base environment< / p > < / li >
< li > < p > Transform observations that are returned by the base environment< / p > < / li >
< li > < p > Transform rewards that are returned by the base environment< / p > < / li >
< / ul >
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< p > Such wrappers can be easily implemented by inheriting from < a class = "reference internal" href = "action_wrappers/#gymnasium.ActionWrapper" title = "gymnasium.ActionWrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.ActionWrapper< / span > < / code > < / a > ,
< a class = "reference internal" href = "observation_wrappers/#gymnasium.ObservationWrapper" title = "gymnasium.ObservationWrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.ObservationWrapper< / span > < / code > < / a > , or < a class = "reference internal" href = "reward_wrappers/#gymnasium.RewardWrapper" title = "gymnasium.RewardWrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.RewardWrapper< / span > < / code > < / a > and implementing the respective transformation.
If you need a wrapper to do more complicated tasks, you can inherit from the < a class = "reference internal" href = "#gymnasium.Wrapper" title = "gymnasium.Wrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper< / span > < / code > < / a > class directly.< / p >
< p > If you’ < a class = "reference external" href = "../../tutorials/implementing_custom_wrappers" > the corresponding tutorial< / a > .< / p >
< section id = "gymnasium-wrapper" >
< h2 > gymnasium.Wrapper< a class = "headerlink" href = "#gymnasium-wrapper" title = "Permalink to this heading" > #< / a > < / h2 >
< dl class = "py class" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper" >
< em class = "property" > < span class = "pre" > class< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > Wrapper< / 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" > < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.core.Env" > < span class = "pre" > Env< / span > < / a > < 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" > ActType< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.Wrapper" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Wraps a < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.Env< / span > < / code > < / a > to allow a modular transformation of the < a class = "reference internal" href = "#gymnasium.Wrapper.step" title = "gymnasium.Wrapper.step" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > step()< / span > < / code > < / a > and < a class = "reference internal" href = "#gymnasium.Wrapper.reset" title = "gymnasium.Wrapper.reset" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > reset()< / span > < / code > < / a > methods.< / p >
< p > This class is the base class of all wrappers to change the behavior of the underlying environment.
Wrappers that inherit from this class can modify the < a class = "reference internal" href = "../vector/#action_space" title = "action_space" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > action_space< / span > < / code > < / a > , < a class = "reference internal" href = "../vector/#observation_space" title = "observation_space" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > observation_space< / span > < / code > < / a > ,
< a class = "reference internal" href = "#gymnasium.Wrapper.reward_range" title = "gymnasium.Wrapper.reward_range" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > reward_range< / span > < / code > < / a > and < a class = "reference internal" href = "#gymnasium.Wrapper.metadata" title = "gymnasium.Wrapper.metadata" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > metadata< / span > < / code > < / a > attributes, without changing the underlying environment’
Moreover, the behavior of the < a class = "reference internal" href = "#gymnasium.Wrapper.step" title = "gymnasium.Wrapper.step" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > step()< / span > < / code > < / a > and < a class = "reference internal" href = "#gymnasium.Wrapper.reset" title = "gymnasium.Wrapper.reset" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > reset()< / span > < / code > < / a > methods can be changed by these wrappers.< / p >
< p > Some attributes (< a class = "reference internal" href = "../registry/#gymnasium.spec" title = "gymnasium.spec" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > spec< / span > < / code > < / a > , < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > render_mode< / span > < / code > , < a class = "reference internal" href = "#gymnasium.Wrapper.np_random" title = "gymnasium.Wrapper.np_random" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > np_random< / span > < / code > < / a > ) will point back to the wrapper’
(i.e. to the corresponding attributes of < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > env< / span > < / code > ).< / p >
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< div class = "admonition note" >
< p class = "admonition-title" > Note< / p >
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< p > If you inherit from < a class = "reference internal" href = "#gymnasium.Wrapper" title = "gymnasium.Wrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > Wrapper< / span > < / code > < / a > , don’ < code class = "docutils literal notranslate" > < span class = "pre" > super().__init__(env)< / span > < / code > < / p >
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< / div >
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< p > Wraps an environment to allow a modular transformation of the < a class = "reference internal" href = "#gymnasium.Wrapper.step" title = "gymnasium.Wrapper.step" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > step()< / span > < / code > < / a > and < a class = "reference internal" href = "#gymnasium.Wrapper.reset" title = "gymnasium.Wrapper.reset" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > reset()< / span > < / code > < / a > methods.< / 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 >
< / dl >
< / dd > < / dl >
< section id = "methods" >
< h3 > Methods< a class = "headerlink" href = "#methods" title = "Permalink to this heading" > #< / a > < / h3 >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.step" >
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< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > step< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > self< / 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" > WrapperActType< / 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" > WrapperObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > SupportsFloat< / 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 = "w" > < / span > < span class = "pre" > bool< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > dict< / 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" > Any< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / span > < a class = "headerlink" href = "#gymnasium.Wrapper.step" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Uses the < a class = "reference internal" href = "#gymnasium.Wrapper.step" title = "gymnasium.Wrapper.step" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > step()< / span > < / code > < / a > of the < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > env< / span > < / code > that can be overwritten to change the returned data.< / p >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.reset" >
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< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > reset< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > self< / span > < / span > < / em > , < em class = "sig-param" > < span class = "o" > < span class = "pre" > *< / 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" > int< / span > < span class = "w" > < / span > < span class = "p" > < span class = "pre" > |< / span > < / span > < span class = "w" > < / span > < span class = "pre" > None< / 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" > options< / span > < / span > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "n" > < span class = "pre" > dict< / 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" > Any< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "w" > < / span > < span class = "p" > < span class = "pre" > |< / span > < / span > < span class = "w" > < / span > < span class = "pre" > None< / 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" > WrapperObsType< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > dict< / 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" > Any< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / span > < / span > < a class = "headerlink" href = "#gymnasium.Wrapper.reset" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Uses the < a class = "reference internal" href = "#gymnasium.Wrapper.reset" title = "gymnasium.Wrapper.reset" > < code class = "xref py py-meth docutils literal notranslate" > < span class = "pre" > reset()< / span > < / code > < / a > of the < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > env< / span > < / code > that can be overwritten to change the returned data.< / p >
< / dd > < / dl >
< dl class = "py function" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.close" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > close< / span > < / span > < span class = "sig-paren" > (< / span > < em class = "sig-param" > < span class = "n" > < span class = "pre" > self< / span > < / span > < / em > < span class = "sig-paren" > )< / span > < a class = "headerlink" href = "#gymnasium.Wrapper.close" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Closes the wrapper and < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > env< / span > < / code > .< / p >
< / dd > < / dl >
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< / section >
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< section id = "attributes" >
< h3 > Attributes< a class = "headerlink" href = "#attributes" title = "Permalink to this heading" > #< / a > < / h3 >
< dl class = "py property" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.action_space" >
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< em class = "property" > < span class = "pre" > property< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > action_space< / span > < / span > < em class = "property" > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < a class = "reference internal" href = "../spaces/#gymnasium.spaces.Space" title = "gymnasium.spaces.Space" > < span class = "pre" > spaces.Space< / span > < / a > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > ActType< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < span class = "w" > < / span > < span class = "p" > < span class = "pre" > |< / span > < / span > < span class = "w" > < / span > < a class = "reference internal" href = "../spaces/#gymnasium.spaces.Space" title = "gymnasium.spaces.Space" > < span class = "pre" > spaces.Space< / span > < / a > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > WrapperActType< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / em > < a class = "headerlink" href = "#gymnasium.Wrapper.action_space" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Return the < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > Env< / span > < / code > < / a > < a class = "reference internal" href = "../vector/#action_space" title = "action_space" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > action_space< / span > < / code > < / a > unless overwritten then the wrapper < a class = "reference internal" href = "../vector/#action_space" title = "action_space" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > action_space< / span > < / code > < / a > is used.< / p >
< / dd > < / dl >
< dl class = "py property" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.observation_space" >
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< em class = "property" > < span class = "pre" > property< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > observation_space< / span > < / span > < em class = "property" > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < a class = "reference internal" href = "../spaces/#gymnasium.spaces.Space" title = "gymnasium.spaces.Space" > < span class = "pre" > spaces.Space< / span > < / a > < 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 = "p" > < span class = "pre" > |< / span > < / span > < span class = "w" > < / span > < a class = "reference internal" href = "../spaces/#gymnasium.spaces.Space" title = "gymnasium.spaces.Space" > < span class = "pre" > spaces.Space< / span > < / a > < span class = "p" > < span class = "pre" > [< / span > < / span > < span class = "pre" > WrapperObsType< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / em > < a class = "headerlink" href = "#gymnasium.Wrapper.observation_space" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Return the < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > Env< / span > < / code > < / a > < a class = "reference internal" href = "../vector/#observation_space" title = "observation_space" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > observation_space< / span > < / code > < / a > unless overwritten then the wrapper < a class = "reference internal" href = "../vector/#observation_space" title = "observation_space" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > observation_space< / span > < / code > < / a > is used.< / p >
< / dd > < / dl >
< dl class = "py property" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.reward_range" >
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< em class = "property" > < span class = "pre" > property< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > reward_range< / span > < / span > < em class = "property" > < 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" > SupportsFloat< / span > < span class = "p" > < span class = "pre" > ,< / span > < / span > < span class = "w" > < / span > < span class = "pre" > SupportsFloat< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / em > < a class = "headerlink" href = "#gymnasium.Wrapper.reward_range" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Return the < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > Env< / span > < / code > < / a > < a class = "reference internal" href = "#gymnasium.Wrapper.reward_range" title = "gymnasium.Wrapper.reward_range" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > reward_range< / span > < / code > < / a > unless overwritten then the wrapper < a class = "reference internal" href = "#gymnasium.Wrapper.reward_range" title = "gymnasium.Wrapper.reward_range" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > reward_range< / span > < / code > < / a > is used.< / p >
< / dd > < / dl >
< dl class = "py property" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.spec" >
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< em class = "property" > < span class = "pre" > property< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > spec< / span > < / span > < em class = "property" > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "pre" > EnvSpec< / span > < span class = "w" > < / span > < span class = "p" > < span class = "pre" > |< / span > < / span > < span class = "w" > < / span > < span class = "pre" > None< / span > < / em > < a class = "headerlink" href = "#gymnasium.Wrapper.spec" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Returns the < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > Env< / span > < / code > < / a > < a class = "reference internal" href = "../registry/#gymnasium.spec" title = "gymnasium.spec" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > spec< / span > < / code > < / a > attribute.< / p >
< / dd > < / dl >
< dl class = "py property" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.metadata" >
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< em class = "property" > < span class = "pre" > property< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > metadata< / span > < / span > < em class = "property" > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "pre" > dict< / 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" > Any< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / em > < a class = "headerlink" href = "#gymnasium.Wrapper.metadata" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Returns the < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > Env< / span > < / code > < / a > < a class = "reference internal" href = "#gymnasium.Wrapper.metadata" title = "gymnasium.Wrapper.metadata" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > metadata< / span > < / code > < / a > .< / p >
< / dd > < / dl >
< dl class = "py property" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.np_random" >
< em class = "property" > < span class = "pre" > property< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > np_random< / span > < / span > < em class = "property" > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < span class = "pre" > Generator< / span > < / em > < a class = "headerlink" href = "#gymnasium.Wrapper.np_random" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > Returns the < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > Env< / span > < / code > < / a > < a class = "reference internal" href = "#gymnasium.Wrapper.np_random" title = "gymnasium.Wrapper.np_random" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > np_random< / span > < / code > < / a > attribute.< / p >
< / dd > < / dl >
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< dl class = "py attribute" >
< dt class = "sig sig-object py" id = "gymnasium.wrappers.gymnasium.Wrapper.env" >
< span class = "sig-prename descclassname" > < span class = "pre" > gymnasium.Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > env< / span > < / span > < a class = "headerlink" href = "#gymnasium.wrappers.gymnasium.Wrapper.env" title = "Permalink to this definition" > #< / a > < / dt >
< dd > < p > The environment (one level underneath) this wrapper.< / p >
< p > This may itself be a wrapped environment.
To obtain the environment underneath all layers of wrappers, use < a class = "reference internal" href = "#gymnasium.Wrapper.unwrapped" title = "gymnasium.Wrapper.unwrapped" > < code class = "xref py py-attr docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper.unwrapped< / span > < / code > < / a > .< / p >
< / dd > < / dl >
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< dl class = "py property" >
< dt class = "sig sig-object py" id = "gymnasium.Wrapper.unwrapped" >
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< em class = "property" > < span class = "pre" > property< / span > < span class = "w" > < / span > < / em > < span class = "sig-prename descclassname" > < span class = "pre" > Wrapper.< / span > < / span > < span class = "sig-name descname" > < span class = "pre" > unwrapped< / span > < / span > < em class = "property" > < span class = "p" > < span class = "pre" > :< / span > < / span > < span class = "w" > < / span > < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.core.Env" > < span class = "pre" > Env< / span > < / a > < 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" > ActType< / span > < span class = "p" > < span class = "pre" > ]< / span > < / span > < / em > < a class = "headerlink" href = "#gymnasium.Wrapper.unwrapped" title = "Permalink to this definition" > #< / a > < / dt >
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< dd > < p > Returns the base environment of the wrapper.< / p >
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< p > This will be the bare < a class = "reference internal" href = "../env/#gymnasium.Env" title = "gymnasium.Env" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > gymnasium.Env< / span > < / code > < / a > environment, underneath all layers of wrappers.< / p >
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< / dd > < / dl >
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< / section >
< / section >
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< section id = "gymnasium-wrappers" >
< h2 > Gymnasium Wrappers< a class = "headerlink" href = "#gymnasium-wrappers" title = "Permalink to this heading" > #< / a > < / h2 >
< p > Gymnasium provides a number of commonly used wrappers listed below. More information can be found on the particular
wrapper in the page on the wrapper type< / p >
< div class = "table-wrapper docutils container" >
< table class = "docutils align-default" >
< thead >
< tr class = "row-odd" > < th class = "head" > < p > Name< / p > < / th >
< th class = "head" > < p > Type< / p > < / th >
< th class = "head" > < p > Description< / p > < / th >
< / tr >
< / thead >
< tbody >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.AtariPreprocessing" title = "gymnasium.wrappers.AtariPreprocessing" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > AtariPreprocessing< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > Implements the common preprocessing applied tp Atari environments< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.AutoResetWrapper" title = "gymnasium.wrappers.AutoResetWrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > AutoResetWrapper< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > The wrapped environment will automatically reset when the terminated or truncated state is reached.< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "action_wrappers/#gymnasium.wrappers.ClipAction" title = "gymnasium.wrappers.ClipAction" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > ClipAction< / span > < / code > < / a > < / p > < / td >
< td > < p > Action Wrapper< / p > < / td >
< td > < p > Clip the continuous action to the valid bound specified by the environment’ < cite > action_space< / cite > < / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.EnvCompatibility" title = "gymnasium.wrappers.EnvCompatibility" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > EnvCompatibility< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > Provides compatibility for environments written in the OpenAI Gym v0.21 API to look like Gymnasium environments< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.FilterObservation" title = "gymnasium.wrappers.FilterObservation" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > FilterObservation< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > Filters a dictionary observation spaces to only requested keys< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.FlattenObservation" title = "gymnasium.wrappers.FlattenObservation" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > FlattenObservation< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > An Observation wrapper that flattens the observation< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.FrameStack" title = "gymnasium.wrappers.FrameStack" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > FrameStack< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > AnObservation wrapper that stacks the observations in a rolling manner.< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.GrayScaleObservation" title = "gymnasium.wrappers.GrayScaleObservation" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > GrayScaleObservation< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > Convert the image observation from RGB to gray scale.< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.HumanRendering" title = "gymnasium.wrappers.HumanRendering" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > HumanRendering< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > Allows human like rendering for environments that support “rgb_array” rendering< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.NormalizeObservation" title = "gymnasium.wrappers.NormalizeObservation" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > NormalizeObservation< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > This wrapper will normalize observations s.t. each coordinate is centered with unit variance.< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "reward_wrappers/#gymnasium.wrappers.NormalizeReward" title = "gymnasium.wrappers.NormalizeReward" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > NormalizeReward< / span > < / code > < / a > < / p > < / td >
< td > < p > Reward Wrapper< / p > < / td >
< td > < p > This wrapper will normalize immediate rewards s.t. their exponential moving average has a fixed variance.< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.OrderEnforcing" title = "gymnasium.wrappers.OrderEnforcing" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > OrderEnforcing< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > This will produce an error if < cite > step< / cite > or < cite > render< / cite > is called before < cite > reset< / cite > < / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.PixelObservationWrapper" title = "gymnasium.wrappers.PixelObservationWrapper" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > PixelObservationWrapper< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > Augment observations by pixel values obtained via < cite > render< / cite > that can be added to or replaces the environments observation.< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.RecordEpisodeStatistics" title = "gymnasium.wrappers.RecordEpisodeStatistics" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > RecordEpisodeStatistics< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > This will keep track of cumulative rewards and episode lengths returning them at the end.< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.RecordVideo" title = "gymnasium.wrappers.RecordVideo" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > RecordVideo< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > This wrapper will record videos of rollouts.< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.RenderCollection" title = "gymnasium.wrappers.RenderCollection" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > RenderCollection< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > Enable list versions of render modes, i.e. “rgb_array_list” for “rgb_array” such that the rendering for each step are saved in a list until < cite > render< / cite > is called.< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "action_wrappers/#gymnasium.wrappers.RescaleAction" title = "gymnasium.wrappers.RescaleAction" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > RescaleAction< / span > < / code > < / a > < / p > < / td >
< td > < p > Action Wrapper< / p > < / td >
< td > < p > Rescales the continuous action space of the environment to a range [< cite > min_action< / cite > , < cite > max_action< / cite > ], where < cite > min_action< / cite > and < cite > max_action< / cite > are numpy arrays or floats.< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.ResizeObservation" title = "gymnasium.wrappers.ResizeObservation" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > ResizeObservation< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > This wrapper works on environments with image observations (or more generally observations of shape AxBxC) and resizes the observation to the shape given by the tuple < cite > shape< / cite > .< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.StepAPICompatibility" title = "gymnasium.wrappers.StepAPICompatibility" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > StepAPICompatibility< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > Modifies an environment step function from (old) done to the (new) termination / truncation API.< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.TimeAwareObservation" title = "gymnasium.wrappers.TimeAwareObservation" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > TimeAwareObservation< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > Augment the observation with current time step in the trajectory (by appending it to the observation).< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.TimeLimit" title = "gymnasium.wrappers.TimeLimit" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > TimeLimit< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > This wrapper will emit a truncated signal if the specified number of steps is exceeded in an episode.< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "observation_wrappers/#gymnasium.wrappers.TransformObservation" title = "gymnasium.wrappers.TransformObservation" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > TransformObservation< / span > < / code > < / a > < / p > < / td >
< td > < p > Observation Wrapper< / p > < / td >
< td > < p > This wrapper will apply function to observations< / p > < / td >
< / tr >
< tr class = "row-even" > < td > < p > < a class = "reference internal" href = "reward_wrappers/#gymnasium.wrappers.TransformReward" title = "gymnasium.wrappers.TransformReward" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > TransformReward< / span > < / code > < / a > < / p > < / td >
< td > < p > Reward Wrapper< / p > < / td >
< td > < p > This wrapper will apply function to rewards< / p > < / td >
< / tr >
< tr class = "row-odd" > < td > < p > < a class = "reference internal" href = "misc_wrappers/#gymnasium.wrappers.VectorListInfo" title = "gymnasium.wrappers.VectorListInfo" > < code class = "xref py py-class docutils literal notranslate" > < span class = "pre" > VectorListInfo< / span > < / code > < / a > < / p > < / td >
< td > < p > Misc Wrapper< / p > < / td >
< td > < p > This wrapper will convert the info of a vectorized environment from the < cite > dict< / cite > format to a < cite > list< / cite > of dictionaries where the i-th dictionary contains info of the i-th environment.< / p > < / td >
< / tr >
< / tbody >
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< li > < a class = "reference internal" href = "#gymnasium-wrapper" > gymnasium.Wrapper< / a > < ul >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#methods" > Methods< / a > < ul >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.step" > < code class = "docutils literal notranslate" > < span class = "pre" > step()< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.reset" > < code class = "docutils literal notranslate" > < span class = "pre" > reset()< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.close" > < code class = "docutils literal notranslate" > < span class = "pre" > close()< / span > < / code > < / a > < / li >
< / ul >
< / li >
< li > < a class = "reference internal" href = "#attributes" > Attributes< / a > < ul >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.action_space" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper.action_space< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.observation_space" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper.observation_space< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.reward_range" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper.reward_range< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.spec" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper.spec< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.metadata" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper.metadata< / span > < / code > < / a > < / li >
< li > < a class = "reference internal" href = "#gymnasium.Wrapper.np_random" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper.np_random< / span > < / code > < / a > < / li >
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< li > < a class = "reference internal" href = "#gymnasium.wrappers.gymnasium.Wrapper.env" > < code class = "docutils literal notranslate" > < span class = "pre" > gymnasium.Wrapper.env< / span > < / code > < / a > < / li >
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< li > < a class = "reference internal" href = "#gymnasium.Wrapper.unwrapped" > < code class = "docutils literal notranslate" > < span class = "pre" > Wrapper.unwrapped< / span > < / code > < / a > < / li >
< / ul >
< / li >
< / ul >
< / li >
< li > < a class = "reference internal" href = "#gymnasium-wrappers" > Gymnasium Wrappers< / a > < / li >
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< / ul >
< / li >
< / ul >
< / div >
< / div >
< / div >
< / aside >
< / div >
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< / div >
< script >
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const toggleMenu = () => {
const menuBtn = document.querySelector(".farama-header-menu__btn");
const menuContainer = document.querySelector(".farama-header-menu-container");
if (document.querySelector(".farama-header-menu").classList.contains("active")) {
menuBtn.ariaExpanded = "false";
menuContainer.ariaHidden = "true";
} else {
menuBtn.ariaExpanded = "true";
menuContainer.ariaHidden = "false";
}
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document.querySelector(".farama-header-menu").classList.toggle("active");
}
document.querySelector(".farama-header-menu__btn").addEventListener("click", toggleMenu);
document.getElementById("farama-close-menu").addEventListener("click", toggleMenu);
< / script >
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< script >
(() => {
if (!localStorage.getItem("shownCookieAlert")) {
const boxElem = document.createElement("div");
boxElem.classList.add("cookie-alert");
const containerElem = document.createElement("div");
containerElem.classList.add("cookie-alert__container");
const textElem = document.createElement("p");
textElem.innerHTML = `This page uses < a href = "https://analytics.google.com/" >
Google Analytics< / a > to collect statistics. You can disable it by blocking
the JavaScript coming from www.google-analytics.com.`;
containerElem.appendChild(textElem);
const closeBtn = document.createElement("button");
closeBtn.innerHTML = `<?xml version="1.0" ?> < svg viewBox = "0 0 32 32" xmlns = "http://www.w3.org/2000/svg" > < defs > < style > . cls-1 { fill : none ; stroke : #000 ; stroke-linecap : round ; stroke-linejoin : round ; stroke-width : 2 px ; } < / style > < / defs > < title / > < g id = "cross" > < line class = "cls-1" x1 = "7" x2 = "25" y1 = "7" y2 = "25" / > < line class = "cls-1" x1 = "7" x2 = "25" y1 = "25" y2 = "7" / > < / g > < / svg > `
closeBtn.onclick = () => {
localStorage.setItem("shownCookieAlert", "true");
boxElem.style.display = "none";
}
containerElem.appendChild(closeBtn);
boxElem.appendChild(containerElem);
document.body.appendChild(boxElem);
}
})()
< / script >
< script async src = "https://www.googletagmanager.com/gtag/js?id=G-6H9C8TWXZ8" > < / script >
< script >
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-6H9C8TWXZ8');
< / script >
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< script data-url_root = "../../" id = "documentation_options" src = "../../_static/documentation_options.js" > < / script >
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< script src = "../../_static/jquery.js" > < / script >
< script src = "../../_static/underscore.js" > < / script >
< script src = "../../_static/_sphinx_javascript_frameworks_compat.js" > < / script >
< script src = "../../_static/doctools.js" > < / script >
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< script src = "../../_static/sphinx_highlight.js" > < / script >
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< script src = "../../_static/scripts/furo.js" > < / script >
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< script >
const createCORSRequest = (method, url) => {
let xhr = new XMLHttpRequest();
xhr.responseType = 'json';
if ("withCredentials" in xhr) {
xhr.open(method, url, true);
} else if (typeof XDomainRequest != "undefined") {
// IE8 & IE9
xhr = new XDomainRequest();
xhr.open(method, url);
} else {
// CORS not supported.
xhr = null;
}
return xhr;
};
const url = 'https://farama.org/api/projects.json';
const imagesBasepath = "https://farama.org/assets/images"
const method = 'GET';
let xhr = createCORSRequest(method, url);
xhr.onload = () => {
const jsonResponse = xhr.response;
const sections = {
"Documentation": [],
"Mature Projects": [],
"Incubating Projects": [],
"Foundation": [
{
name: "About",
link: "https://farama.org/about"
},
{
name: "Standards",
link: "https://farama.org/project_standards",
},
{
name: "Donate",
link: "https://farama.org/donations"
}
]
}
Object.keys(jsonResponse).forEach(key => {
projectJson = jsonResponse[key];
if (projectJson.website !== null) {
projectJson.link = projectJson.website;
sections["Documentation"].push(projectJson)
} else if (projectJson.type == "mature") {
projectJson.link = projectJson.github;
sections["Mature Projects"].push(projectJson)
} else {
projectJson.link = projectJson.github;
sections["Incubating Projects"].push(projectJson)
}
})
const menuContainer = document.querySelector(".farama-header-menu__body");
Object.keys(sections).forEach((key, i) => {
projects = sections[key];
const sectionElem = Object.assign(
document.createElement('div'), {
className:'farama-header-menu__section',
style: "padding-left: 24px"
}
)
sectionElem.appendChild(Object.assign(document.createElement('span'),
{
className:'farama-header-menu__section-title' ,
innerText: key
}
))
const ulElem = Object.assign(document.createElement('ul'),
{
className:'farama-header-menu-list',
}
)
for (let project of projects) {
const liElem = document.createElement("li");
const aElem = Object.assign(document.createElement("a"),
{
href: project.link
}
);
liElem.appendChild(aElem);
if (key !== "Foundation") {
const imgElem = Object.assign(document.createElement("img"),
{
src: project.image ? imagesBasepath + project.image : imagesBasepath + "/farama_black.svg",
alt: `${project.name} logo`,
className: "farama-black-logo-invert"
}
);
aElem.appendChild(imgElem);
}
aElem.appendChild(document.createTextNode(project.name));
ulElem.appendChild(liElem);
}
sectionElem.appendChild(ulElem);
menuContainer.appendChild(sectionElem)
});
}
xhr.onerror = function() {
console.error("Unable to load projects");
};
xhr.send();
< / script >
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< script >
const versioningConfig = {
githubUser: 'Farama-Foundation',
githubRepo: 'Gymnasium',
};
fetch('/_static/versioning/versioning_menu.html').then(response => {
if (response.status === 200) {
response.text().then(text => {
const container = document.createElement("div");
container.innerHTML = text;
document.querySelector("body").appendChild(container);
// innerHtml doenst evaluate scripts, we need to add them dynamically
Array.from(container.querySelectorAll("script")).forEach(oldScript => {
const newScript = document.createElement("script");
Array.from(oldScript.attributes).forEach(attr => newScript.setAttribute(attr.name, attr.value));
newScript.appendChild(document.createTextNode(oldScript.innerHTML));
oldScript.parentNode.replaceChild(newScript, oldScript);
});
});
} else {
console.warn("Unable to load versioning menu", response);
}
});
< / script > < / body >
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< / html >
