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<p class="caption" role="heading"><span class="caption-text">Introduction</span></p>
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<article role="main">
<section id="wrappers">
<h1>Wrappers<a class="headerlink" href="#wrappers" title="Permalink to this heading">#</a></h1>
<div class="toctree-wrapper compound">
</div>
<span class="target" id="module-gymnasium.wrappers"></span><p>Module of wrapper classes.</p>
<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
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>
<p>In order to wrap an environment, you must first initialize a base environment. Then you can pass this environment along
with (possibly optional) parameters to the wrapper’s constructor.</p>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">gymnasium</span> <span class="k">as</span> <span class="nn">gym</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">gymnasium.wrappers</span> <span class="kn">import</span> <span class="n">RescaleAction</span>
<span class="gp">&gt;&gt;&gt; </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">&quot;Hopper-v4&quot;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">base_env</span><span class="o">.</span><span class="n">action_space</span>
<span class="go">Box(-1.0, 1.0, (3,), float32)</span>
<span class="gp">&gt;&gt;&gt; </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">&gt;&gt;&gt; </span><span class="n">wrapped_env</span><span class="o">.</span><span class="n">action_space</span>
<span class="go">Box(-1.0, 1.0, (3,), float32)</span>
</pre></div>
</div>
<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>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">wrapped_env</span>
<span class="go">&lt;RescaleAction&lt;TimeLimit&lt;OrderEnforcing&lt;PassiveEnvChecker&lt;HopperEnv&lt;Hopper-v4&gt;&gt;&gt;&gt;&gt;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">wrapped_env</span><span class="o">.</span><span class="n">env</span>
<span class="go">&lt;TimeLimit&lt;OrderEnforcing&lt;PassiveEnvChecker&lt;HopperEnv&lt;Hopper-v4&gt;&gt;&gt;&gt;&gt;</span>
</pre></div>
</div>
<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>
<div class="doctest highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">wrapped_env</span>
<span class="go">&lt;RescaleAction&lt;TimeLimit&lt;OrderEnforcing&lt;PassiveEnvChecker&lt;HopperEnv&lt;Hopper-v4&gt;&gt;&gt;&gt;&gt;&gt;</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">wrapped_env</span><span class="o">.</span><span class="n">unwrapped</span>
<span class="go">&lt;gymnasium.envs.mujoco.hopper_v4.HopperEnv object at 0x7fbb5efd0490&gt;</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>
<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’d like to implement your own custom wrapper, check out <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><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’s attributes.
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’s environment
(i.e. to the corresponding attributes of <code class="xref py py-attr docutils literal notranslate"><span class="pre">env</span></code>).</p>
<div class="admonition note">
<p class="admonition-title">Note</p>
<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’t forget to call <code class="docutils literal notranslate"><span class="pre">super().__init__(env)</span></code></p>
</div>
<dl class="field-list simple">
<dt class="field-odd">Parameters<span class="colon">:</span></dt>
<dd class="field-odd"><p><strong>env</strong> – The environment to wrap</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">
<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">&#x2192;</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>
<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">
<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">&#x2192;</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>
<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>
</section>
<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">
<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>
<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">
<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>
<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">
<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>
<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">
<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><a class="reference internal" href="../registry/#gymnasium.envs.registration.EnvSpec" title="gymnasium.envs.registration.EnvSpec"><span class="pre">EnvSpec</span></a><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>
<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 with the <cite>WrapperSpec</cite> if the wrapper inherits from <cite>EzPickle</cite>.</p>
</dd></dl>
<dl class="py property">
<dt class="sig sig-object py" id="gymnasium.Wrapper.metadata">
<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>
<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>
<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>
<dl class="py property">
<dt class="sig sig-object py" id="gymnasium.Wrapper.unwrapped">
<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>
<dd><p>Returns the base environment of the wrapper.</p>
<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>
</dd></dl>
</section>
</section>
<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’s <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>
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<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>
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<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>
<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>
<li><a class="reference internal" href="#gymnasium.Wrapper.unwrapped"><code class="docutils literal notranslate"><span class="pre">Wrapper.unwrapped</span></code></a></li>
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