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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>
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<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>
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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="../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="../box2d/car_racing/">Car Racing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../mujoco/ant/">Ant</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/half_cheetah/">Half Cheetah</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/hopper/">Hopper</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/humanoid/">Humanoid</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/humanoid_standup/">Humanoid Standup</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/inverted_double_pendulum/">Inverted Double Pendulum</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/inverted_pendulum/">Inverted Pendulum</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/pusher/">Pusher</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/reacher/">Reacher</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/swimmer/">Swimmer</a></li>
<li class="toctree-l2"><a class="reference internal" href="../mujoco/walker2d/">Walker2D</a></li>
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<li class="toctree-l1 current has-children current-page"><a class="current reference internal" href="#">Atari</a><input checked="" class="toctree-checkbox" id="toctree-checkbox-8" name="toctree-checkbox-8" role="switch" type="checkbox"/><label for="toctree-checkbox-8"><div class="visually-hidden">Toggle navigation of Atari</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
<li class="toctree-l2"><a class="reference internal" href="adventure/">Adventure</a></li>
<li class="toctree-l2"><a class="reference internal" href="air_raid/">AirRaid</a></li>
<li class="toctree-l2"><a class="reference internal" href="alien/">Alien</a></li>
<li class="toctree-l2"><a class="reference internal" href="amidar/">Amidar</a></li>
<li class="toctree-l2"><a class="reference internal" href="assault/">Assault</a></li>
<li class="toctree-l2"><a class="reference internal" href="asterix/">Asterix</a></li>
<li class="toctree-l2"><a class="reference internal" href="asteroids/">Asteroids</a></li>
<li class="toctree-l2"><a class="reference internal" href="atlantis/">Atlantis</a></li>
<li class="toctree-l2"><a class="reference internal" href="atlantis2/">Atlantis2</a></li>
<li class="toctree-l2"><a class="reference internal" href="backgammon/">Backgammon</a></li>
<li class="toctree-l2"><a class="reference internal" href="bank_heist/">BankHeist</a></li>
<li class="toctree-l2"><a class="reference internal" href="basic_math/">BasicMath</a></li>
<li class="toctree-l2"><a class="reference internal" href="battle_zone/">BattleZone</a></li>
<li class="toctree-l2"><a class="reference internal" href="beam_rider/">BeamRider</a></li>
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<li class="toctree-l2"><a class="reference internal" href="chopper_command/">ChopperCommand</a></li>
<li class="toctree-l2"><a class="reference internal" href="crazy_climber/">CrazyClimber</a></li>
<li class="toctree-l2"><a class="reference internal" href="crossbow/">Crossbow</a></li>
<li class="toctree-l2"><a class="reference internal" href="darkchambers/">Darkchambers</a></li>
<li class="toctree-l2"><a class="reference internal" href="defender/">Defender</a></li>
<li class="toctree-l2"><a class="reference internal" href="demon_attack/">DemonAttack</a></li>
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<li class="toctree-l2"><a class="reference internal" href="double_dunk/">DoubleDunk</a></li>
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<article role="main">
<section class="tex2jax_ignore mathjax_ignore" id="atari">
<h1>Atari<a class="headerlink" href="#atari" title="Link to this heading"></a></h1>
<p>A set of Atari 2600 environments simulated through <a class="reference external" href="https://github.com/stella-emu/stella">Stella</a> and the <a class="reference external" href="https://github.com/mgbellemare/Arcade-Learning-Environment">Arcade Learning Environment</a>.</p>
<div class="toctree-wrapper compound">
</div>
<div class="env-grid">
<a href="adventure">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/adventure.gif">
</div>
<div class="cell__title">
<span>Adventure</span>
</div>
</div>
</a>
<a href="air_raid">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/air_raid.gif">
</div>
<div class="cell__title">
<span>Air Raid</span>
</div>
</div>
</a>
<a href="alien">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/alien.gif">
</div>
<div class="cell__title">
<span>Alien</span>
</div>
</div>
</a>
<a href="amidar">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/amidar.gif">
</div>
<div class="cell__title">
<span>Amidar</span>
</div>
</div>
</a>
<a href="assault">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/assault.gif">
</div>
<div class="cell__title">
<span>Assault</span>
</div>
</div>
</a>
<a href="asterix">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/asterix.gif">
</div>
<div class="cell__title">
<span>Asterix</span>
</div>
</div>
</a>
<a href="asteroids">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/asteroids.gif">
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<span>Asteroids</span>
</div>
</div>
</a>
<a href="atlantis">
<div class="env-grid__cell">
<div class="cell__image-container">
<img src="/_static/videos/atari/atlantis.gif">
</div>
<div class="cell__title">
<span>Atlantis</span>
</div>
</div>
</a>
</div>
<a href="./complete_list">
<button class="more-btn">
See More Environments
</button>
</a>
<p>Atari environments are simulated via the Arcade Learning Environment (ALE) <a class="reference internal" href="#1"><span class="xref myst">[1]</span></a> through the Stella emulator.</p>
<section id="autorom-installing-the-roms">
<h2>AutoROM (installing the ROMs)<a class="headerlink" href="#autorom-installing-the-roms" title="Link to this heading"></a></h2>
<p>ALE-py doesnt include the atari ROMs (<code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">gymnasium[atari]</span></code>) which are necessary to make any of the atari environments.
To install the atari ROM, use <code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">gymnasium[accept-rom-license]</span></code> which will install AutoROM and download the ROMs, install them in the default location.
In doing so, you agree to own a license to these Atari 2600 ROMs and agree to not distribution these ROMS.</p>
<p>It is possible to install the ROMs in an alternative location, <a class="reference external" href="https://github.com/Farama-Foundation/AutoROM">AutoROM</a> has more information.</p>
</section>
<section id="action-space">
<h2>Action Space<a class="headerlink" href="#action-space" title="Link to this heading"></a></h2>
<p>Each environment will use a sub-set of the full action space listed below:</p>
<div class="table-wrapper colwidths-auto docutils container">
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Value</p></th>
<th class="head"><p>Meaning</p></th>
<th class="head"><p>Value</p></th>
<th class="head"><p>Meaning</p></th>
<th class="head"><p>Value</p></th>
<th class="head"><p>Meaning</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">0</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">NOOP</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">1</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">FIRE</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">2</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">UP</span></code></p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">3</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">RIGHT</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">4</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">LEFT</span></code></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">DOWN</span></code></p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">6</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">UPRIGHT</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">7</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">UPLEFT</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">8</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">DOWNRIGHT</span></code></p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">9</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">DOWNLEFT</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">10</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">UPFIRE</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">11</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">RIGHTFIRE</span></code></p></td>
</tr>
<tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">12</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">LEFTFIRE</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">13</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">DOWNFIRE</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">14</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">UPRIGHTFIRE</span></code></p></td>
</tr>
<tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">15</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">UPLEFTFIRE</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">16</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">DOWNRIGHTFIRE</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">17</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">DOWNLEFTFIRE</span></code></p></td>
</tr>
</tbody>
</table>
</div>
<p>By default, most environments use a smaller subset of the legal actions excluding any actions that dont have an effect in the game.
If users are interested in using all possible actions, pass 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">gymnasium.make</span></code>.</p>
</section>
<section id="observation-space">
<h2>Observation Space<a class="headerlink" href="#observation-space" title="Link to this heading"></a></h2>
<p>The Atari environments observation can be</p>
<ol class="arabic simple">
<li><p>The RGB image that is displayed to a human player using <code class="docutils literal notranslate"><span class="pre">obs_type=&quot;rgb&quot;</span></code> with observation space <code class="docutils literal notranslate"><span class="pre">Box(0,</span> <span class="pre">255,</span> <span class="pre">(210,</span> <span class="pre">160,</span> <span class="pre">3),</span> <span class="pre">np.uint8)</span></code></p></li>
<li><p>The grayscale version of the RGB image using <code class="docutils literal notranslate"><span class="pre">obs_type=&quot;grayscale&quot;</span></code> with observation space <code class="docutils literal notranslate"><span class="pre">Box(0,</span> <span class="pre">255,</span> <span class="pre">(210,</span> <span class="pre">160),</span> <span class="pre">np.uint8)</span></code></p></li>
<li><p>The RAM state (128 bytes) from the console using <code class="docutils literal notranslate"><span class="pre">obs_type=&quot;ram&quot;</span></code> with observation space <code class="docutils literal notranslate"><span class="pre">Box(0,</span> <span class="pre">255,</span> <span class="pre">(128),</span> <span class="pre">np.uint8)</span></code></p></li>
</ol>
</section>
<section id="rewards">
<h2>Rewards<a class="headerlink" href="#rewards" title="Link to this heading"></a></h2>
<p>The exact reward dynamics depend on the environment and are usually documented in the games manual. You can
find these manuals on <a class="reference external" href="https://atariage.com/">AtariAge</a>.</p>
</section>
<section id="stochasticity">
<h2>Stochasticity<a class="headerlink" href="#stochasticity" title="Link to this heading"></a></h2>
<p>As the Atari games are entirely deterministic, agents could achieve
state-of-the-art performance by simply memorizing an optimal sequence of actions while completely ignoring observations from the environment.</p>
<p>To avoid this, there are several methods to avoid this.</p>
<ol class="arabic simple">
<li><p>Sticky actions: Instead of always simulating the action passed to the environment, there is a small
probability that the previously executed action is used instead. In the v0 and v5 environments, the probability of
repeating an action is <code class="docutils literal notranslate"><span class="pre">25%</span></code> while in v4 environments, the probability is <code class="docutils literal notranslate"><span class="pre">0%</span></code>. Users can specify the repeat action
probability using <code class="docutils literal notranslate"><span class="pre">repeat_action_probability</span></code> to <code class="docutils literal notranslate"><span class="pre">make</span></code>.</p></li>
<li><p>Frameskipping: On each environment step, the action can be repeated for a random number of frames. This behavior
may be altered by setting the keyword argument <code class="docutils literal notranslate"><span class="pre">frameskip</span></code> to either a positive integer or
a tuple of two positive integers. If <code class="docutils literal notranslate"><span class="pre">frameskip</span></code> is an integer, frame skipping is deterministic, and in each step the action is
repeated <code class="docutils literal notranslate"><span class="pre">frameskip</span></code> many times. Otherwise, if <code class="docutils literal notranslate"><span class="pre">frameskip</span></code> is a tuple, the number of skipped frames is chosen uniformly at
random between <code class="docutils literal notranslate"><span class="pre">frameskip[0]</span></code> (inclusive) and <code class="docutils literal notranslate"><span class="pre">frameskip[1]</span></code> (exclusive) in each environment step.</p></li>
</ol>
</section>
<section id="common-arguments">
<h2>Common Arguments<a class="headerlink" href="#common-arguments" title="Link to this heading"></a></h2>
<p>When initializing Atari environments via <code class="docutils literal notranslate"><span class="pre">gymnasium.make</span></code>, you may pass some additional arguments. These work for any
Atari environment.</p>
<ul class="simple">
<li><p><strong>mode</strong>: <code class="docutils literal notranslate"><span class="pre">int</span></code>. Game mode, see <a class="reference internal" href="#2"><span class="xref myst">[2]</span></a>. Legal values depend on the environment and are listed in the table above.</p></li>
<li><p><strong>difficulty</strong>: <code class="docutils literal notranslate"><span class="pre">int</span></code>. The difficulty of the game, see <a class="reference internal" href="#2"><span class="xref myst">[2]</span></a>. Legal values depend on the environment and are listed in
the table above. Together with <code class="docutils literal notranslate"><span class="pre">mode</span></code>, this determines the “flavor” of the game.</p></li>
<li><p><strong>obs_type</strong>: <code class="docutils literal notranslate"><span class="pre">str</span></code>. This argument determines what observations are returned by the environment. Its values are:</p>
<ul>
<li><p>“ram”: The 128 Bytes of RAM are returned</p></li>
<li><p>“rgb”: An RGB rendering of the game is returned</p></li>
<li><p>“grayscale”: A grayscale rendering is returned</p></li>
</ul>
</li>
<li><p><strong>frameskip</strong>: <code class="docutils literal notranslate"><span class="pre">int</span></code> or a tuple of two <code class="docutils literal notranslate"><span class="pre">int</span></code>s. This argument controls stochastic frame skipping, as described in the section on stochasticity.</p></li>
<li><p><strong>repeat_action_probability</strong>: <code class="docutils literal notranslate"><span class="pre">float</span></code>. The probability that an action is repeated, also called “sticky actions”, as described in the section on stochasticity.</p></li>
<li><p><strong>full_action_space</strong>: <code class="docutils literal notranslate"><span class="pre">bool</span></code>. If set to <code class="docutils literal notranslate"><span class="pre">True</span></code>, the action space consists of all legal actions on the console. Otherwise, the
action space will be reduced to a subset.</p></li>
<li><p><strong>render_mode</strong>: <code class="docutils literal notranslate"><span class="pre">str</span></code>. Specifies the rendering mode. Its values are:</p>
<ul>
<li><p>human: Display the screen and enable game sounds. This will lock emulation to the ROMs specified FPS</p></li>
<li><p>rgb_array: Returns the current environment RGB frame of the environment.</p></li>
</ul>
</li>
</ul>
</section>
<section id="version-history-and-naming-schemes">
<h2>Version History and Naming Schemes<a class="headerlink" href="#version-history-and-naming-schemes" title="Link to this heading"></a></h2>
<p>All Atari games are available in three versions. They differ in the default settings of the arguments above.
The differences are listed in the following table:</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>Varies with the suffix (see below).</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>Varies with the suffix (see below).</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">4</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>
</tbody>
</table>
</div>
<blockquote>
<div><p>Version v5 follows the best practices outlined in <a class="reference internal" href="#2"><span class="xref myst">[2]</span></a>. Thus, it is recommended to transition to v5 and
customize the environment using the arguments above, if necessary.</p>
</div></blockquote>
<p>For each Atari game, several different configurations are registered in Gymnasium. The naming schemes are analogous for
v0 and v4. Let us take a look at all variations of Amidar-v0 that are registered with gymnasium:</p>
<div class="table-wrapper colwidths-auto docutils container">
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Name</p></th>
<th class="head"><p><code class="docutils literal notranslate"><span class="pre">obs_type=</span></code></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>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Amidar-v0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;rgb&quot;</span></code></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>
</tr>
<tr class="row-odd"><td><p>AmidarDeterministic-v0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;rgb&quot;</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">4</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.0</span></code></p></td>
</tr>
<tr class="row-even"><td><p>AmidarNoframeskip-v0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;rgb&quot;</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">1</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.25</span></code></p></td>
</tr>
<tr class="row-odd"><td><p>Amidar-ram-v0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;ram&quot;</span></code></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>
</tr>
<tr class="row-even"><td><p>Amidar-ramDeterministic-v0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;ram&quot;</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">4</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.0</span></code></p></td>
</tr>
<tr class="row-odd"><td><p>Amidar-ramNoframeskip-v0</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;ram&quot;</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">1</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.25</span></code></p></td>
</tr>
</tbody>
</table>
</div>
<p>Things change in v5: The suffixes “Deterministic” and “NoFrameskip” are no longer available. Instead, you must specify the
environment configuration via arguments passed to <code class="docutils literal notranslate"><span class="pre">gymnasium.make</span></code>. Moreover, the v5 environments
are in the “ALE” namespace. The suffix “-ram” is still available. Thus, we get the following table:</p>
<div class="table-wrapper colwidths-auto docutils container">
<table class="docutils align-default">
<thead>
<tr class="row-odd"><th class="head"><p>Name</p></th>
<th class="head"><p><code class="docutils literal notranslate"><span class="pre">obs_type=</span></code></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>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>ALE/Amidar-v5</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;rgb&quot;</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">4</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.25</span></code></p></td>
</tr>
<tr class="row-odd"><td><p>ALE/Amidar-ram-v5</p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">&quot;ram&quot;</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">4</span></code></p></td>
<td><p><code class="docutils literal notranslate"><span class="pre">0.25</span></code></p></td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="flavors">
<h2>Flavors<a class="headerlink" href="#flavors" title="Link to this heading"></a></h2>
<p>Some games allow the user to set a difficulty level and a game mode. Different modes/difficulties may have different
game dynamics and (if a reduced action space is used) different action spaces. We follow the convention of <a class="reference internal" href="#2"><span class="xref myst">[2]</span></a> and
refer to the combination of difficulty level and game mode as a flavor of a game. The following table shows
the available modes and difficulty levels for different Atari games:</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>Possible Modes</p></th>
<th class="head"><p>Default Mode</p></th>
<th class="head"><p>Possible Difficulties</p></th>
<th class="head"><p>Default Difficulty</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>Adventure</p></td>
<td><p>[0, 1, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>AirRaid</p></td>
<td><p>[1, …, 8]</p></td>
<td><p>1</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Alien</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Amidar</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Assault</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Asterix</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Asteroids</p></td>
<td><p>[0, …, 31, 128]</p></td>
<td><p>0</p></td>
<td><p>[0, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Atlantis</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Atlantis2</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Backgammon</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>BankHeist</p></td>
<td><p>[0, 4, 8, 12, 16, 20, 24, 28]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>BasicMath</p></td>
<td><p>[5, 6, 7, 8]</p></td>
<td><p>5</p></td>
<td><p>[0, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>BattleZone</p></td>
<td><p>[1, 2, 3]</p></td>
<td><p>1</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>BeamRider</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Berzerk</p></td>
<td><p>[1, …, 9, 16, 17, 18]</p></td>
<td><p>1</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Blackjack</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Bowling</p></td>
<td><p>[0, 2, 4]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Boxing</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Breakout</p></td>
<td><p>[0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Carnival</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Casino</p></td>
<td><p>[0, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Centipede</p></td>
<td><p>[22, 86]</p></td>
<td><p>22</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>ChopperCommand</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>CrazyClimber</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Crossbow</p></td>
<td><p>[0, 2, 4, 6]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Darkchambers</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Defender</p></td>
<td><p>[1, …, 9, 16]</p></td>
<td><p>1</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>DemonAttack</p></td>
<td><p>[1, 3, 5, 7]</p></td>
<td><p>1</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>DonkeyKong</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>DoubleDunk</p></td>
<td><p>[0, …, 15]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Earthworld</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>ElevatorAction</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Enduro</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Entombed</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Et</p></td>
<td><p>[0, 1, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>FishingDerby</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>FlagCapture</p></td>
<td><p>[8, 9, 10]</p></td>
<td><p>8</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Freeway</p></td>
<td><p>[0, …, 7]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Frogger</p></td>
<td><p>[0, 1, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Frostbite</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Galaxian</p></td>
<td><p>[1, …, 9]</p></td>
<td><p>1</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Gopher</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Gravitar</p></td>
<td><p>[0, 1, 2, 3, 4]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Hangman</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>HauntedHouse</p></td>
<td><p>[0, …, 8]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Hero</p></td>
<td><p>[0, 1, 2, 3, 4]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>HumanCannonball</p></td>
<td><p>[0, …, 7]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>IceHockey</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Jamesbond</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>JourneyEscape</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Kaboom</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Kangaroo</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>KeystoneKapers</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>KingKong</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Klax</p></td>
<td><p>[0, 1, 2]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Koolaid</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Krull</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>KungFuMaster</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>LaserGates</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>LostLuggage</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>MarioBros</p></td>
<td><p>[0, 2, 4, 6]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>MiniatureGolf</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>MontezumaRevenge</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>MrDo</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>MsPacman</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>NameThisGame</p></td>
<td><p>[8, 24, 40]</p></td>
<td><p>8</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Othello</p></td>
<td><p>[0, 1, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Pacman</p></td>
<td><p>[0, …, 7]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Phoenix</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Pitfall</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Pitfall2</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Pong</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Pooyan</p></td>
<td><p>[10, 30, 50, 70]</p></td>
<td><p>10</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>PrivateEye</p></td>
<td><p>[0, 1, 2, 3, 4]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Qbert</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Riverraid</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>RoadRunner</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Robotank</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Seaquest</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>SirLancelot</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Skiing</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Solaris</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>SpaceInvaders</p></td>
<td><p>[0, …, 15]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>SpaceWar</p></td>
<td><p>[6, …, 17]</p></td>
<td><p>6</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>StarGunner</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Superman</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Surround</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Tennis</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Tetris</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>TicTacToe3D</p></td>
<td><p>[0, …, 8]</p></td>
<td><p>0</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>TimePilot</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Trondead</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>Turmoil</p></td>
<td><p>[0, …, 8]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Tutankham</p></td>
<td><p>[0, 4, 8, 12]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>UpNDown</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Venture</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>VideoCheckers</p></td>
<td><p>[1, …, 9, 11, …, 19]</p></td>
<td><p>1</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>VideoChess</p></td>
<td><p>[0, 1, 2, 3, 4]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>VideoCube</p></td>
<td><p>[0, 1, 2, 100, 101, 102, …, 5000, 5001, 5002]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>VideoPinball</p></td>
<td><p>[0, 2]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>WizardOfWor</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>WordZapper</p></td>
<td><p>[0, …, 23]</p></td>
<td><p>0</p></td>
<td><p>[0, 1, 2, 3]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-even"><td><p>YarsRevenge</p></td>
<td><p>[0, 32, 64, 96]</p></td>
<td><p>0</p></td>
<td><p>[0, 1]</p></td>
<td><p>0</p></td>
</tr>
<tr class="row-odd"><td><p>Zaxxon</p></td>
<td><p>[0, 8, 16, 24]</p></td>
<td><p>0</p></td>
<td><p>[0]</p></td>
<td><p>0</p></td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="references">
<h2>References<a class="headerlink" href="#references" title="Link to this heading"></a></h2>
<p id="id1"><a id="1">[1]</a>
MG Bellemare, Y Naddaf, J Veness, and M Bowling.
“The arcade learning environment: An evaluation platform for general agents.”
Journal of Artificial Intelligence Research (2012).</p>
<p id="id2"><a id="2">[2]</a>
Machado et al.
“Revisiting the Arcade Learning Environment: Evaluation Protocols
and Open Problems for General Agents”
Journal of Artificial Intelligence Research (2018)
URL: https://jair.org/index.php/jair/article/view/11182</p>
</section>
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</article>
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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>