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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 = "../../../../../introduction/basic_usage/" > Basic Usage< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../introduction/train_agent/" > Training an Agent< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../introduction/create_custom_env/" > Create a Custom Environment< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../introduction/record_agent/" > Recording Agents< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../introduction/speed_up_env/" > Speeding Up Training< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../introduction/gym_compatibility/" > Compatibility with Gym< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../introduction/migration_guide/" > Migration Guide - v0.21 to v1.0.0< / a > < / li >
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< p class = "caption" role = "heading" > < span class = "caption-text" > API< / span > < / p >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../api/env/" > Env< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../api/registry/" > Make and register< / a > < / li >
< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../../../../api/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 navigation of Spaces< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/spaces/fundamental/" > Fundamental Spaces< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/spaces/composite/" > Composite Spaces< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/spaces/utils/" > Spaces Utils< / a > < / li >
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< / ul >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../../../../api/wrappers/" > Wrappers< / 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 navigation of Wrappers< / 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 = "../../../../../api/wrappers/misc_wrappers/" > Misc Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/wrappers/action_wrappers/" > Action Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/wrappers/observation_wrappers/" > Observation Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/wrappers/reward_wrappers/" > Reward Wrappers< / a > < / li >
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< / ul >
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< li class = "toctree-l1 has-children" > < a class = "reference internal" href = "../../../../../api/vector/" > Vectorize< / 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 navigation of Vectorize< / div > < i class = "icon" > < svg > < use href = "#svg-arrow-right" > < / use > < / svg > < / i > < / label > < ul >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/vector/wrappers/" > Wrappers< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/vector/async_vector_env/" > AsyncVectorEnv< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/vector/sync_vector_env/" > SyncVectorEnv< / a > < / li >
< li class = "toctree-l2" > < a class = "reference internal" href = "../../../../../api/vector/utils/" > Utility functions< / a > < / li >
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< / ul >
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< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../api/utils/" > Utility functions< / a > < / li >
< li class = "toctree-l1" > < a class = "reference internal" href = "../../../../../api/functional/" > Functional Env< / 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/classic_control/" > Classic Control< / 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 navigation of Classic Control< / 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/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 >
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< h1 > Source code for gymnasium.wrappers.vector.common< / h1 > < div class = "highlight" > < pre >
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< span > < / span > < span class = "sd" > " " " Wrapper that tracks the cumulative rewards and episode lengths." " " < / span >
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< span class = "kn" > from< / span > < span class = "w" > < / span > < span class = "nn" > __future__< / span > < span class = "w" > < / span > < span class = "kn" > import< / span > < span class = "n" > annotations< / span >
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< span class = "kn" > import< / span > < span class = "w" > < / span > < span class = "nn" > time< / span >
< span class = "kn" > from< / span > < span class = "w" > < / span > < span class = "nn" > collections< / span > < span class = "w" > < / span > < span class = "kn" > import< / span > < span class = "n" > deque< / span >
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< span class = "kn" > import< / span > < span class = "w" > < / span > < span class = "nn" > numpy< / span > < span class = "w" > < / span > < span class = "k" > as< / span > < span class = "w" > < / span > < span class = "nn" > np< / span >
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< span class = "kn" > from< / span > < span class = "w" > < / span > < span class = "nn" > gymnasium.core< / span > < span class = "w" > < / span > < span class = "kn" > import< / span > < span class = "n" > ActType< / span > < span class = "p" > ,< / span > < span class = "n" > ObsType< / span >
< span class = "kn" > from< / span > < span class = "w" > < / span > < span class = "nn" > gymnasium.logger< / span > < span class = "w" > < / span > < span class = "kn" > import< / span > < span class = "n" > warn< / span >
< span class = "kn" > from< / span > < span class = "w" > < / span > < span class = "nn" > gymnasium.vector.vector_env< / span > < span class = "w" > < / span > < span class = "kn" > import< / span > < span class = "p" > (< / span >
< span class = "n" > ArrayType< / span > < span class = "p" > ,< / span >
< span class = "n" > AutoresetMode< / span > < span class = "p" > ,< / span >
< span class = "n" > VectorEnv< / span > < span class = "p" > ,< / span >
< span class = "n" > VectorWrapper< / span > < span class = "p" > ,< / span >
< span class = "p" > )< / span >
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< span class = "n" > __all__< / span > < span class = "o" > =< / span > < span class = "p" > [< / span > < span class = "s2" > " RecordEpisodeStatistics" < / span > < span class = "p" > ]< / span >
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< div class = "viewcode-block" id = "RecordEpisodeStatistics" >
< a class = "viewcode-back" href = "../../../../../api/vector/wrappers/#gymnasium.wrappers.vector.RecordEpisodeStatistics" > [docs]< / a >
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< span class = "k" > class< / span > < span class = "w" > < / span > < span class = "nc" > RecordEpisodeStatistics< / span > < span class = "p" > (< / span > < span class = "n" > VectorWrapper< / span > < span class = "p" > ):< / span >
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< span class = "w" > < / span > < span class = "sd" > " " " This wrapper will keep track of cumulative rewards and episode lengths.< / span >
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< span class = "sd" > At the end of any episode within the vectorized env, the statistics of the episode< / span >
< span class = "sd" > will be added to ``info`` using the key ``episode``, and the ``_episode`` key< / span >
< span class = "sd" > is used to indicate the environment index which has a terminated or truncated episode.< / span >
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< span class = "sd" > > > > infos = { # doctest: +SKIP< / span >
< span class = "sd" > ... ...< / span >
< span class = "sd" > ... " episode" : {< / span >
< span class = "sd" > ... " r" : " < array of cumulative reward for each done sub-environment> " ,< / span >
< span class = "sd" > ... " l" : " < array of episode length for each done sub-environment> " ,< / span >
< span class = "sd" > ... " t" : " < array of elapsed time since beginning of episode for each done sub-environment> " < / span >
< span class = "sd" > ... },< / span >
< span class = "sd" > ... " _episode" : " < boolean array of length num-envs> " < / span >
< span class = "sd" > ... }< / span >
< span class = "sd" > Moreover, the most recent rewards and episode lengths are stored in buffers that can be accessed via< / span >
< span class = "sd" > :attr:`wrapped_env.return_queue` and :attr:`wrapped_env.length_queue` respectively.< / span >
< span class = "sd" > Attributes:< / span >
< span class = "sd" > return_queue: The cumulative rewards of the last ``deque_size``-many episodes< / span >
< span class = "sd" > length_queue: The lengths of the last ``deque_size``-many episodes< / span >
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< span class = "sd" > Example:< / span >
< span class = "sd" > > > > from pprint import pprint< / span >
< span class = "sd" > > > > import gymnasium as gym< / span >
< span class = "sd" > > > > envs = gym.make_vec(" CartPole-v1" , num_envs=3)< / span >
< span class = "sd" > > > > envs = RecordEpisodeStatistics(envs)< / span >
< span class = "sd" > > > > obs, info = envs.reset(123)< / span >
< span class = "sd" > > > > _ = envs.action_space.seed(123)< / span >
< span class = "sd" > > > > end = False< / span >
< span class = "sd" > > > > while not end:< / span >
< span class = "sd" > ... obs, rew, term, trunc, info = envs.step(envs.action_space.sample())< / span >
< span class = "sd" > ... end = term.any() or trunc.any()< / span >
< span class = "sd" > ...< / span >
< span class = "sd" > > > > envs.close()< / span >
< span class = "sd" > > > > pprint(info) # doctest: +SKIP< / span >
< span class = "sd" > {' _episode' : array([ True, False, False]),< / span >
< span class = "sd" > ' _final_info' : array([ True, False, False]),< / span >
< span class = "sd" > ' _final_observation' : array([ True, False, False]),< / span >
< span class = "sd" > ' episode' : {' l' : array([11, 0, 0], dtype=int32),< / span >
< span class = "sd" > ' r' : array([11., 0., 0.], dtype=float32),< / span >
< span class = "sd" > ' t' : array([0.007812, 0. , 0. ], dtype=float32)},< / span >
< span class = "sd" > ' final_info' : array([{}, None, None], dtype=object),< / span >
< span class = "sd" > ' final_observation' : array([array([ 0.11448676, 0.9416149 , -0.20946532, -1.7619033 ], dtype=float32),< / span >
< span class = "sd" > None, None], dtype=object)}< / span >
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< span class = "sd" > " " " < / span >
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< span class = "k" > def< / span > < span class = "w" > < / span > < span class = "fm" > __init__< / span > < span class = "p" > (< / span >
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< span class = "bp" > self< / span > < span class = "p" > ,< / span >
< span class = "n" > env< / span > < span class = "p" > :< / span > < span class = "n" > VectorEnv< / span > < span class = "p" > ,< / span >
< span class = "n" > buffer_length< / span > < span class = "p" > :< / span > < span class = "nb" > int< / span > < span class = "o" > =< / span > < span class = "mi" > 100< / span > < span class = "p" > ,< / span >
< span class = "n" > stats_key< / span > < span class = "p" > :< / span > < span class = "nb" > str< / span > < span class = "o" > =< / span > < span class = "s2" > " episode" < / span > < span class = "p" > ,< / span >
< span class = "p" > ):< / span >
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< span class = "w" > < / span > < span class = "sd" > " " " This wrapper will keep track of cumulative rewards and episode lengths.< / span >
< span class = "sd" > Args:< / span >
< span class = "sd" > env (Env): The environment to apply the wrapper< / span >
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< span class = "sd" > buffer_length: The size of the buffers :attr:`return_queue`, :attr:`length_queue` and :attr:`time_queue`< / span >
< span class = "sd" > stats_key: The info key to save the data< / span >
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< span class = "sd" > " " " < / span >
< span class = "nb" > super< / span > < span class = "p" > ()< / span > < span class = "o" > .< / span > < span class = "fm" > __init__< / span > < span class = "p" > (< / span > < span class = "n" > env< / span > < span class = "p" > )< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _stats_key< / span > < span class = "o" > =< / span > < span class = "n" > stats_key< / span >
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< span class = "k" > if< / span > < span class = "s2" > " autoreset_mode" < / span > < span class = "ow" > not< / span > < span class = "ow" > in< / span > < span class = "bp" > self< / 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 = "n" > warn< / span > < span class = "p" > (< / span > < span class = "s2" > " todo" < / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _autoreset_mode< / span > < span class = "o" > =< / span > < span class = "n" > AutoresetMode< / span > < span class = "o" > .< / span > < span class = "n" > NEXT_STEP< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "k" > assert< / span > < span class = "nb" > isinstance< / span > < span class = "p" > (< / span > < span class = "bp" > self< / 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" > " autoreset_mode" < / span > < span class = "p" > ],< / span > < span class = "n" > AutoresetMode< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _autoreset_mode< / span > < span class = "o" > =< / span > < span class = "bp" > self< / 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" > " autoreset_mode" < / span > < span class = "p" > ]< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_count< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_start_times< / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > ndarray< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > zeros< / span > < span class = "p" > ((< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,))< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_returns< / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > ndarray< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > zeros< / span > < span class = "p" > ((< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,))< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_lengths< / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > ndarray< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > zeros< / span > < span class = "p" > ((< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,),< / span > < span class = "n" > dtype< / span > < span class = "o" > =< / span > < span class = "nb" > int< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > ndarray< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > zeros< / span > < span class = "p" > ((< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,),< / span > < span class = "n" > dtype< / span > < span class = "o" > =< / span > < span class = "nb" > bool< / span > < span class = "p" > )< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > time_queue< / span > < span class = "o" > =< / span > < span class = "n" > deque< / span > < span class = "p" > (< / span > < span class = "n" > maxlen< / span > < span class = "o" > =< / span > < span class = "n" > buffer_length< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > return_queue< / span > < span class = "o" > =< / span > < span class = "n" > deque< / span > < span class = "p" > (< / span > < span class = "n" > maxlen< / span > < span class = "o" > =< / span > < span class = "n" > buffer_length< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > length_queue< / span > < span class = "o" > =< / span > < span class = "n" > deque< / span > < span class = "p" > (< / span > < span class = "n" > maxlen< / span > < span class = "o" > =< / span > < span class = "n" > buffer_length< / span > < span class = "p" > )< / span >
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< span class = "k" > def< / span > < span class = "w" > < / span > < span class = "nf" > reset< / span > < span class = "p" > (< / span >
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< span class = "bp" > self< / span > < span class = "p" > ,< / span >
< span class = "n" > seed< / span > < span class = "p" > :< / span > < span class = "nb" > int< / span > < span class = "o" > |< / span > < span class = "nb" > list< / span > < span class = "p" > [< / span > < span class = "nb" > int< / span > < span class = "p" > ]< / span > < span class = "o" > |< / span > < span class = "kc" > None< / span > < span class = "o" > =< / span > < span class = "kc" > None< / span > < span class = "p" > ,< / span >
< span class = "n" > options< / span > < span class = "p" > :< / span > < span class = "nb" > dict< / span > < span class = "o" > |< / span > < span class = "kc" > None< / span > < span class = "o" > =< / span > < span class = "kc" > None< / span > < span class = "p" > ,< / span >
< span class = "p" > ):< / span >
< span class = "w" > < / span > < span class = "sd" > " " " Resets the environment using kwargs and resets the episode returns and lengths." " " < / span >
< span class = "n" > obs< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span > < span class = "o" > =< / span > < span class = "nb" > super< / span > < span class = "p" > ()< / span > < span class = "o" > .< / span > < span class = "n" > reset< / span > < span class = "p" > (< / span > < span class = "n" > seed< / span > < span class = "o" > =< / span > < span class = "n" > seed< / span > < span class = "p" > ,< / span > < span class = "n" > options< / span > < span class = "o" > =< / span > < span class = "n" > options< / span > < span class = "p" > )< / span >
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< span class = "k" > if< / span > < span class = "n" > options< / span > < span class = "ow" > is< / span > < span class = "ow" > not< / span > < span class = "kc" > None< / span > < span class = "ow" > and< / span > < span class = "s2" > " reset_mask" < / span > < span class = "ow" > in< / span > < span class = "n" > options< / span > < span class = "p" > :< / span >
< span class = "n" > reset_mask< / span > < span class = "o" > =< / span > < span class = "n" > options< / span > < span class = "o" > .< / span > < span class = "n" > pop< / span > < span class = "p" > (< / span > < span class = "s2" > " reset_mask" < / span > < span class = "p" > )< / span >
< span class = "k" > assert< / span > < span class = "nb" > isinstance< / span > < span class = "p" > (< / span >
< span class = "n" > reset_mask< / span > < span class = "p" > ,< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > ndarray< / span >
< span class = "p" > ),< / span > < span class = "sa" > f< / span > < span class = "s2" > " `options[' reset_mask' : mask]` must be a numpy array, got < / span > < span class = "si" > {< / span > < span class = "nb" > type< / span > < span class = "p" > (< / span > < span class = "n" > reset_mask< / span > < span class = "p" > )< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
< span class = "k" > assert< / span > < span class = "n" > reset_mask< / span > < span class = "o" > .< / span > < span class = "n" > shape< / span > < span class = "o" > ==< / span > < span class = "p" > (< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,< / span >
< span class = "p" > ),< / span > < span class = "sa" > f< / span > < span class = "s2" > " `options[' reset_mask' : mask]` must have shape `(< / span > < span class = "si" > {< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "si" > }< / span > < span class = "s2" > ,)`, got < / span > < span class = "si" > {< / span > < span class = "n" > reset_mask< / span > < span class = "o" > .< / span > < span class = "n" > shape< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
< span class = "k" > assert< / span > < span class = "p" > (< / span >
< span class = "n" > reset_mask< / span > < span class = "o" > .< / span > < span class = "n" > dtype< / span > < span class = "o" > ==< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > bool_< / span >
< span class = "p" > ),< / span > < span class = "sa" > f< / span > < span class = "s2" > " `options[' reset_mask' : mask]` must have `dtype=np.bool_`, got < / span > < span class = "si" > {< / span > < span class = "n" > reset_mask< / span > < span class = "o" > .< / span > < span class = "n" > dtype< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
< span class = "k" > assert< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > any< / span > < span class = "p" > (< / span >
< span class = "n" > reset_mask< / span >
< span class = "p" > ),< / span > < span class = "sa" > f< / span > < span class = "s2" > " `options[' reset_mask' : mask]` must contain a boolean array, got reset_mask=< / span > < span class = "si" > {< / span > < span class = "n" > reset_mask< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_start_times< / span > < span class = "p" > [< / span > < span class = "n" > reset_mask< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "n" > time< / span > < span class = "o" > .< / span > < span class = "n" > perf_counter< / span > < span class = "p" > ()< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_returns< / span > < span class = "p" > [< / span > < span class = "n" > reset_mask< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_lengths< / span > < span class = "p" > [< / span > < span class = "n" > reset_mask< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > [< / span > < span class = "n" > reset_mask< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "kc" > False< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_start_times< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > full< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,< / span > < span class = "n" > time< / span > < span class = "o" > .< / span > < span class = "n" > perf_counter< / span > < span class = "p" > ())< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_returns< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > zeros< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_lengths< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > zeros< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,< / span > < span class = "n" > dtype< / span > < span class = "o" > =< / span > < span class = "nb" > int< / span > < span class = "p" > )< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > zeros< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > num_envs< / span > < span class = "p" > ,< / span > < span class = "n" > dtype< / span > < span class = "o" > =< / span > < span class = "nb" > bool< / span > < span class = "p" > )< / span >
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< span class = "k" > return< / span > < span class = "n" > obs< / span > < span class = "p" > ,< / span > < span class = "n" > info< / span >
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< span class = "k" > def< / span > < span class = "w" > < / span > < span class = "nf" > step< / span > < span class = "p" > (< / span >
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< span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > actions< / span > < span class = "p" > :< / span > < span class = "n" > ActType< / span >
< span class = "p" > )< / span > < span class = "o" > -> < / span > < span class = "nb" > tuple< / span > < span class = "p" > [< / span > < span class = "n" > ObsType< / span > < span class = "p" > ,< / span > < span class = "n" > ArrayType< / span > < span class = "p" > ,< / span > < span class = "n" > ArrayType< / span > < span class = "p" > ,< / span > < span class = "n" > ArrayType< / span > < span class = "p" > ,< / span > < span class = "nb" > dict< / span > < span class = "p" > ]:< / span >
< span class = "w" > < / span > < span class = "sd" > " " " Steps through the environment, recording the episode statistics." " " < / span >
< span class = "p" > (< / span >
< span class = "n" > observations< / span > < span class = "p" > ,< / span >
< span class = "n" > rewards< / span > < span class = "p" > ,< / span >
< span class = "n" > terminations< / span > < span class = "p" > ,< / span >
< span class = "n" > truncations< / span > < span class = "p" > ,< / span >
< span class = "n" > infos< / span > < span class = "p" > ,< / span >
< span class = "p" > )< / span > < span class = "o" > =< / span > < span class = "bp" > self< / 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" > actions< / span > < span class = "p" > )< / span >
< span class = "k" > assert< / span > < span class = "nb" > isinstance< / span > < span class = "p" > (< / span >
< span class = "n" > infos< / span > < span class = "p" > ,< / span > < span class = "nb" > dict< / span >
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< span class = "p" > ),< / span > < span class = "sa" > f< / span > < span class = "s2" > " `vector.RecordEpisodeStatistics` requires `info` type to be `dict`, its actual type is < / span > < span class = "si" > {< / span > < span class = "nb" > type< / span > < span class = "p" > (< / span > < span class = "n" > infos< / span > < span class = "p" > )< / span > < span class = "si" > }< / span > < span class = "s2" > . This may be due to usage of other wrappers in the wrong order." < / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_returns< / span > < span class = "p" > [< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_returns< / span > < span class = "p" > [< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > logical_not< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > )]< / span > < span class = "o" > +=< / span > < span class = "n" > rewards< / span > < span class = "p" > [< / span >
< span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > logical_not< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > )< / span >
< span class = "p" > ]< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_lengths< / span > < span class = "p" > [< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "mi" > 0< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_lengths< / span > < span class = "p" > [< / span > < span class = "o" > ~< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > ]< / span > < span class = "o" > +=< / span > < span class = "mi" > 1< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_start_times< / span > < span class = "p" > [< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "n" > time< / span > < span class = "o" > .< / span > < span class = "n" > perf_counter< / span > < span class = "p" > ()< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > prev_dones< / span > < span class = "o" > =< / span > < span class = "n" > dones< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > logical_or< / span > < span class = "p" > (< / span > < span class = "n" > terminations< / span > < span class = "p" > ,< / span > < span class = "n" > truncations< / span > < span class = "p" > )< / span >
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< span class = "n" > num_dones< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > sum< / span > < span class = "p" > (< / span > < span class = "n" > dones< / span > < span class = "p" > )< / span >
< span class = "k" > if< / span > < span class = "n" > num_dones< / span > < span class = "p" > :< / span >
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< span class = "k" > if< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _stats_key< / span > < span class = "ow" > in< / span > < span class = "n" > infos< / span > < span class = "ow" > or< / span > < span class = "sa" > f< / span > < span class = "s2" > " _< / span > < span class = "si" > {< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _stats_key< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "ow" > in< / span > < span class = "n" > infos< / span > < span class = "p" > :< / span >
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< span class = "k" > raise< / span > < span class = "ne" > ValueError< / span > < span class = "p" > (< / span >
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< span class = "sa" > f< / span > < span class = "s2" > " Attempted to add episode stats with key ' < / span > < span class = "si" > {< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _stats_key< / span > < span class = "si" > }< / span > < span class = "s2" > ' but this key already exists in info: < / span > < span class = "si" > {< / span > < span class = "nb" > list< / span > < span class = "p" > (< / span > < span class = "n" > infos< / span > < span class = "o" > .< / span > < span class = "n" > keys< / span > < span class = "p" > ())< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span >
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< span class = "p" > )< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
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< span class = "n" > episode_time_length< / span > < span class = "o" > =< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > round< / span > < span class = "p" > (< / span >
< span class = "n" > time< / span > < span class = "o" > .< / span > < span class = "n" > perf_counter< / span > < span class = "p" > ()< / span > < span class = "o" > -< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_start_times< / span > < span class = "p" > ,< / span > < span class = "mi" > 6< / span >
< span class = "p" > )< / span >
< span class = "n" > infos< / span > < span class = "p" > [< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _stats_key< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "p" > {< / span >
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< span class = "s2" > " r" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > where< / span > < span class = "p" > (< / span > < span class = "n" > dones< / span > < span class = "p" > ,< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_returns< / span > < span class = "p" > ,< / span > < span class = "mf" > 0.0< / span > < span class = "p" > ),< / span >
< span class = "s2" > " l" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > where< / span > < span class = "p" > (< / span > < span class = "n" > dones< / span > < span class = "p" > ,< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_lengths< / span > < span class = "p" > ,< / span > < span class = "mi" > 0< / span > < span class = "p" > ),< / span >
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< span class = "s2" > " t" < / span > < span class = "p" > :< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > where< / span > < span class = "p" > (< / span > < span class = "n" > dones< / span > < span class = "p" > ,< / span > < span class = "n" > episode_time_length< / span > < span class = "p" > ,< / span > < span class = "mf" > 0.0< / span > < span class = "p" > ),< / span >
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< span class = "p" > }< / span >
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< span class = "n" > infos< / span > < span class = "p" > [< / span > < span class = "sa" > f< / span > < span class = "s2" > " _< / span > < span class = "si" > {< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _stats_key< / span > < span class = "si" > }< / span > < span class = "s2" > " < / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "n" > dones< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_count< / span > < span class = "o" > +=< / span > < span class = "n" > num_dones< / span >
< span class = "k" > for< / span > < span class = "n" > i< / span > < span class = "ow" > in< / span > < span class = "n" > np< / span > < span class = "o" > .< / span > < span class = "n" > where< / span > < span class = "p" > (< / span > < span class = "n" > dones< / span > < span class = "p" > ):< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > time_queue< / span > < span class = "o" > .< / span > < span class = "n" > extend< / span > < span class = "p" > (< / span > < span class = "n" > episode_time_length< / span > < span class = "p" > [< / span > < span class = "n" > i< / span > < span class = "p" > ])< / span >
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< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > return_queue< / span > < span class = "o" > .< / span > < span class = "n" > extend< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_returns< / span > < span class = "p" > [< / span > < span class = "n" > i< / span > < span class = "p" > ])< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > length_queue< / span > < span class = "o" > .< / span > < span class = "n" > extend< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > episode_lengths< / span > < span class = "p" > [< / span > < span class = "n" > i< / span > < span class = "p" > ])< / span >
< span class = "k" > return< / span > < span class = "p" > (< / span >
< span class = "n" > observations< / span > < span class = "p" > ,< / span >
< span class = "n" > rewards< / span > < span class = "p" > ,< / span >
< span class = "n" > terminations< / span > < span class = "p" > ,< / span >
< span class = "n" > truncations< / span > < span class = "p" > ,< / span >
< span class = "n" > infos< / span > < span class = "p" > ,< / span >
< span class = "p" > )< / span > < / div >
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< / pre > < / div >
< / article >
< / div >
< footer >
< div class = "related-pages" >
< / div >
< div class = "bottom-of-page" >
< div class = "left-details" >
< div class = "copyright" >
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Copyright © 2025 Farama Foundation
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< / div >
<!--
Made with < a href = "https://www.sphinx-doc.org/" > Sphinx< / a > and < a class = "muted-link" href = "https://pradyunsg.me" > @pradyunsg< / a > 's
< a href = "https://github.com/pradyunsg/furo" > Furo< / a >
-->
< / div >
< div class = "right-details" >
< div class = "icons" >
< a class = "muted-link" href = "https://github.com/Farama-Foundation/Gymnasium/"
aria-label="On GitHub">
< svg stroke = "currentColor" fill = "currentColor" stroke-width = "0" viewBox = "0 0 16 16" >
< path fill-rule = "evenodd"
d="M8 0C3.58 0 0 3.58 0 8c0 3.54 2.29 6.53 5.47 7.59.4.07.55-.17.55-.38 0-.19-.01-.82-.01-1.49-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82.64-.18 1.32-.27 2-.27.68 0 1.36.09 2 .27 1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48 0 1.07-.01 1.93-.01 2.2 0 .21.15.46.55.38A8.013 8.013 0 0 0 16 8c0-4.42-3.58-8-8-8z">
< / path >
< / svg >
< / a >
< / div >
< / div >
< / div >
< / footer >
< / div >
< aside class = "toc-drawer no-toc" >
< / aside >
< / div >
< / div >
< / div >
< script >
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.setAttribute("aria-expanded", "false");
menuContainer.setAttribute("aria-hidden", "true");
} else {
menuBtn.setAttribute("aria-expanded", "true");
menuContainer.setAttribute("aria-hidden", "false");
}
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 async src = "https://www.googletagmanager.com/gtag/js?id=G-6H9C8TWXZ8" > < / script >
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< script >
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const enableGtag = () => {
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'G-6H9C8TWXZ8');
}
(() => {
if (!localStorage.getItem("acceptedCookieAlert")) {
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.`;
containerElem.appendChild(textElem);
const declineBtn = Object.assign(document.createElement("button"),
{
innerText: "Deny",
className: "farama-btn cookie-alert__button",
id: "cookie-alert__decline",
}
);
declineBtn.addEventListener("click", () => {
localStorage.setItem("acceptedCookieAlert", false);
boxElem.remove();
});
const acceptBtn = Object.assign(document.createElement("button"),
{
innerText: "Allow",
className: "farama-btn cookie-alert__button",
id: "cookie-alert__accept",
}
);
acceptBtn.addEventListener("click", () => {
localStorage.setItem("acceptedCookieAlert", true);
boxElem.remove();
enableGtag();
});
containerElem.appendChild(declineBtn);
containerElem.appendChild(acceptBtn);
boxElem.appendChild(containerElem);
document.body.appendChild(boxElem);
} else if (localStorage.getItem("acceptedCookieAlert") === "true") {
enableGtag();
}
})()
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< / script >
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< script src = "../../../../../_static/documentation_options.js?v=25d39d6f" > < / script >
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< script src = "../../../../../_static/doctools.js?v=9a2dae69" > < / script >
< script src = "../../../../../_static/sphinx_highlight.js?v=dc90522c" > < / script >
< script src = "../../../../../_static/scripts/furo.js?v=7660844c" > < / script >
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< script >
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const createProjectsList = (projects, displayImages) => {
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 (displayImages) {
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);
}
return ulElem;
}
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// Create menu with Farama projects by using the API at farama.org/api/projects.json
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 = {
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"Core Projects": [],
"Mature Projects": {
"Documentation": [],
"Repositories": [],
},
"Incubating Projects": {
"Documentation": [],
"Repositories": [],
},
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"Foundation": [
{
name: "About",
link: "https://farama.org/about"
},
{
name: "Standards",
link: "https://farama.org/project_standards",
},
{
name: "Donate",
link: "https://farama.org/donations"
}
]
}
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// Categorize projects
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Object.keys(jsonResponse).forEach(key => {
projectJson = jsonResponse[key];
if (projectJson.website !== null) {
projectJson.link = projectJson.website;
} else {
projectJson.link = projectJson.github;
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}
if (projectJson.type === "core") {
sections["Core Projects"].push(projectJson)
} else if (projectJson.type == "mature") {
if (projectJson.website !== null) {
sections["Mature Projects"]["Documentation"].push(projectJson)
} else {
sections["Mature Projects"]["Repositories"].push(projectJson)
}
} else {
if (projectJson.website !== null) {
sections["Incubating Projects"]["Documentation"].push(projectJson)
} else {
sections["Incubating Projects"]["Repositories"].push(projectJson)
}
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}
})
const menuContainer = document.querySelector(".farama-header-menu__body");
Object.keys(sections).forEach((key, i) => {
const sectionElem = Object.assign(
document.createElement('div'), {
className:'farama-header-menu__section',
}
)
sectionElem.appendChild(Object.assign(document.createElement('span'),
{
className:'farama-header-menu__section-title' ,
innerText: key
}
))
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// is not a list
if (sections[key].constructor !== Array) {
const subSections = sections[key];
const subSectionContainerElem = Object.assign(
document.createElement('div'), {
className:'farama-header-menu__subsections-container',
style: 'display: flex'
}
)
Object.keys(subSections).forEach((subKey, i) => {
const subSectionElem = Object.assign(
document.createElement('div'), {
className:'farama-header-menu__subsection',
}
)
subSectionElem.appendChild(Object.assign(document.createElement('span'),
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{
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className:'farama-header-menu__subsection-title' ,
innerText: subKey
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}
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))
const ulElem = createProjectsList(subSections[subKey], key !== 'Foundation');
subSectionElem.appendChild(ulElem);
subSectionContainerElem.appendChild(subSectionElem);
})
sectionElem.appendChild(subSectionContainerElem);
} else {
const projects = sections[key];
const ulElem = createProjectsList(projects, true);
sectionElem.appendChild(ulElem);
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}
menuContainer.appendChild(sectionElem)
});
}
xhr.onerror = function() {
console.error("Unable to load projects");
};
xhr.send();
< / script >
< script >
const versioningConfig = {
githubUser: 'Farama-Foundation',
githubRepo: 'Gymnasium',
};
fetch('/main/_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 >
< / html >
