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<article role="main">
<section id="gopher">
<h1>Gopher<a class="headerlink" href="#gopher" title="Permalink to this heading">#</a></h1>
<figure class="align-default" id="id1">
<a class="reference internal image-reference" href="../../../_images/gopher.gif"><img alt="../../../_images/gopher.gif" src="../../../_images/gopher.gif" style="width: 120px;" /></a>
</figure>
<p>This environment is part of the <a href='..'>Atari environments</a>. Please read that page first for general information.</p>
<div class="table-wrapper colwidths-auto docutils container">
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<thead>
<tr class="row-odd"><th class="head"><p></p></th>
<th class="head"><p></p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Action Space</p></td>
<td><p>Discrete(18)</p></td>
</tr>
<tr class="row-odd"><td><p>Observation Space</p></td>
<td><p>(210, 160, 3)</p></td>
</tr>
<tr class="row-even"><td><p>Observation High</p></td>
<td><p>255</p></td>
</tr>
<tr class="row-odd"><td><p>Observation Low</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Import</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">gymnasium.make(&quot;ALE/Gopher-v5&quot;)</span></code></p></td>
</tr>
</tbody>
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</div>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this heading">#</a></h2>
<p>The player controls a shovel-wielding farmer who protects a crop of three carrots from a gopher. <a class="reference external" href="https://atariage.com/manual_html_page.php?SoftwareLabelID=218">the AtariAge page</a>.</p>
</section>
<section id="rewards">
<h2>Rewards<a class="headerlink" href="#rewards" title="Permalink to this heading">#</a></h2>
<p>The exact reward dynamics depend on the environment and are usually documented in the game’s manual. You can
find these manuals on <a class="reference external" href="https://atariage.com/manual_html_page.php?SoftwareLabelID=218">AtariAge</a>.</p>
<p>Atari environments are simulated via the Arcade Learning Environment (ALE) <a class="reference internal" href="../#id1"><span class="std std-ref">[1]</span></a>.</p>
</section>
<section id="action-space">
<h2>Action Space<a class="headerlink" href="#action-space" title="Permalink to this heading">#</a></h2>
<p>The action space a subset of the following discrete set of legal actions:</p>
<div class="table-wrapper colwidths-auto docutils container">
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Num</p></th>
<th class="head"><p>Action</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0</p></td>
<td><p>NOOP</p></td>
</tr>
<tr class="row-odd"><td><p>1</p></td>
<td><p>FIRE</p></td>
</tr>
<tr class="row-even"><td><p>2</p></td>
<td><p>UP</p></td>
</tr>
<tr class="row-odd"><td><p>3</p></td>
<td><p>RIGHT</p></td>
</tr>
<tr class="row-even"><td><p>4</p></td>
<td><p>LEFT</p></td>
</tr>
<tr class="row-odd"><td><p>5</p></td>
<td><p>DOWN</p></td>
</tr>
<tr class="row-even"><td><p>6</p></td>
<td><p>UPRIGHT</p></td>
</tr>
<tr class="row-odd"><td><p>7</p></td>
<td><p>UPLEFT</p></td>
</tr>
<tr class="row-even"><td><p>8</p></td>
<td><p>DOWNRIGHT</p></td>
</tr>
<tr class="row-odd"><td><p>9</p></td>
<td><p>DOWNLEFT</p></td>
</tr>
<tr class="row-even"><td><p>10</p></td>
<td><p>UPFIRE</p></td>
</tr>
<tr class="row-odd"><td><p>11</p></td>
<td><p>RIGHTFIRE</p></td>
</tr>
<tr class="row-even"><td><p>12</p></td>
<td><p>LEFTFIRE</p></td>
</tr>
<tr class="row-odd"><td><p>13</p></td>
<td><p>DOWNFIRE</p></td>
</tr>
<tr class="row-even"><td><p>14</p></td>
<td><p>UPRIGHTFIRE</p></td>
</tr>
<tr class="row-odd"><td><p>15</p></td>
<td><p>UPLEFTFIRE</p></td>
</tr>
<tr class="row-even"><td><p>16</p></td>
<td><p>DOWNRIGHTFIRE</p></td>
</tr>
<tr class="row-odd"><td><p>17</p></td>
<td><p>DOWNLEFTFIRE</p></td>
</tr>
</tbody>
</table>
</div>
<p>If you use v0 or v4 and the environment is initialized via <code class="docutils literal notranslate"><span class="pre">make</span></code>, the action space will usually be much smaller since most legal actions don’t have
any effect. Thus, the enumeration of the actions will differ. The action space can be expanded to the full
legal space by passing the keyword argument <code class="docutils literal notranslate"><span class="pre">full_action_space=True</span></code> to <code class="docutils literal notranslate"><span class="pre">make</span></code>.</p>
<p>The reduced action space of an Atari environment may depend on the flavor of the game. You can specify the flavor by providing
the arguments <code class="docutils literal notranslate"><span class="pre">difficulty</span></code> and <code class="docutils literal notranslate"><span class="pre">mode</span></code> when constructing the environment. This documentation only provides details on the
action spaces of default flavors.</p>
</section>
<section id="observations">
<h2>Observations<a class="headerlink" href="#observations" title="Permalink to this heading">#</a></h2>
<p>By default, the environment returns the RGB image that is displayed to human players as an observation. However, it is
possible to observe</p>
<ul class="simple">
<li><p>The 128 Bytes of RAM of the console</p></li>
<li><p>A grayscale image</p></li>
</ul>
<p>instead. The respective observation spaces are</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">Box([0</span> <span class="pre">...</span> <span class="pre">0],</span> <span class="pre">[255</span> <span class="pre">...</span> <span class="pre">255],</span> <span class="pre">(128,),</span> <span class="pre">uint8)</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">Box([[0</span> <span class="pre">...</span> <span class="pre">0]</span> <span class="pre">...</span> <span class="pre">[0</span>&#160; <span class="pre">...</span> <span class="pre">0]],</span> <span class="pre">[[255</span> <span class="pre">...</span> <span class="pre">255]</span> <span class="pre">...</span> <span class="pre">[255</span>&#160; <span class="pre">...</span> <span class="pre">255]],</span> <span class="pre">(250,</span> <span class="pre">160),</span> <span class="pre">uint8)</span> </code></p></li>
</ul>
<p>respectively. The general article on Atari environments outlines different ways to instantiate corresponding environments
via <code class="docutils literal notranslate"><span class="pre">gymnasium.make</span></code>.</p>
</section>
<section id="arguments">
<h2>Arguments<a class="headerlink" href="#arguments" title="Permalink to this heading">#</a></h2>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">env</span> <span class="o">=</span> <span class="n">gymnasium</span><span class="o">.</span><span class="n">make</span><span class="p">(</span><span class="s2">&quot;ALE/Gopher-v5&quot;</span><span class="p">)</span>
</pre></div>
</div>
<p>The various ways to configure the environment are described in detail in the article on Atari environments.</p>
<div class="table-wrapper colwidths-auto docutils container">
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Environment</p></th>
<th class="head"><p>Valid Modes</p></th>
<th class="head"><p>Valid Difficulties</p></th>
<th class="head"><p>Default Mode</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Gopher</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">[0,</span> <span class="pre">2]</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">[0,</span> <span class="pre">1]</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0</span></code></p></td>
</tr>
</tbody>
</table>
</div>
<p>You may use the suffix “-ram” to switch to the RAM observation space. In v0 and v4, the suffixes “Deterministic” and “NoFrameskip”
are available. These are no longer supported in v5. In order to obtain equivalent behavior, pass keyword arguments to <code class="docutils literal notranslate"><span class="pre">gymnasium.make</span></code> as outlined in
the general article on Atari environments.
The versions v0 and v4 are not contained in the “ALE” namespace. I.e. they are instantiated via <code class="docutils literal notranslate"><span class="pre">gymnasium.make(&quot;Gopher-v0&quot;)</span></code>.</p>
</section>
<section id="version-history">
<h2>Version History<a class="headerlink" href="#version-history" title="Permalink to this heading">#</a></h2>
<p>A thorough discussion of the intricate differences between the versions and configurations can be found in the
general article on Atari environments.</p>
<div class="table-wrapper colwidths-auto docutils container">
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Version</p></th>
<th class="head"><p><code class="docutils literal notranslate"><span class="pre">frameskip=</span></code></p></th>
<th class="head"><p><code class="docutils literal notranslate"><span class="pre">repeat_action_probability=</span></code></p></th>
<th class="head"><p><code class="docutils literal notranslate"><span class="pre">full_action_space=</span></code></p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>v0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">(2,</span> <span class="pre">5,)</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.25</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">False</span></code></p></td>
</tr>
<tr class="row-odd"><td><p>v4</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">(2,</span> <span class="pre">5,)</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.0</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">False</span></code></p></td>
</tr>
<tr class="row-even"><td><p>v5</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">5</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.25</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">True</span></code></p></td>
</tr>
</tbody>
</table>
</div>
<blockquote>
<div><p>Version v5 follows the best practices outlined in <a class="reference internal" href="../#id2"><span class="std std-ref">[2]</span></a>. Thus, it is recommended to transition to v5 and
customize the environment using the arguments above, if necessary.</p>
</div></blockquote>
</section>
</section>
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<ul>
<li><a class="reference internal" href="#">Gopher</a><ul>
<li><a class="reference internal" href="#description">Description</a></li>
<li><a class="reference internal" href="#rewards">Rewards</a></li>
<li><a class="reference internal" href="#action-space">Action Space</a></li>
<li><a class="reference internal" href="#observations">Observations</a></li>
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