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Gym-MiniGrid
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  <p class="caption" role="heading"><span class="caption-text">Introduction</span></p>
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<li class="toctree-l1"><a class="reference internal" href="../../../content/basic_usage/">Basic Usage</a></li>
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<li class="toctree-l1 has-children"><a class="reference internal" href="../../../api/wrapper/">Wrapper</a><input class="toctree-checkbox" id="toctree-checkbox-1" name="toctree-checkbox-1" role="switch" type="checkbox"/><label for="toctree-checkbox-1"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
<li class="toctree-l2"><a class="reference internal" href="../../../api/wrappers/">Action Bonus</a></li>
<li class="toctree-l2"><a class="reference internal" href="../../../api/wrappers/#dict-observation-space">Dict Observation Space</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../BlockedUnlockPickupEnv/">Blocked Unlock Pickup</a></li>
<li class="toctree-l2 current current-page"><a class="current reference internal" href="#">Crossing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="../UnlockEnv/">Unlock</a></li>
<li class="toctree-l2"><a class="reference internal" href="../UnlockPickupEnv/">Unlock Pickup</a></li>
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            <section id="crossing">
<h1>Crossing<a class="headerlink" href="#crossing" title="Permalink to this heading">#</a></h1>
<figure class="align-default">
<a class="reference internal image-reference" href="../../../_images/CrossingEnv.gif"><img alt="Crossing" src="../../../_images/CrossingEnv.gif" style="width: 200px;" /></a>
</figure>
<section id="description">
<h2>Description<a class="headerlink" href="#description" title="Permalink to this heading">#</a></h2>
<p>Depending on the <code class="docutils literal notranslate"><span class="pre">obstacle_type</span></code> parameter:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">Lava</span></code> - The agent has to reach the green goal square on the other corner
of the room while avoiding rivers of deadly lava which terminate the
episode in failure. Each lava stream runs across the room either
horizontally or vertically, and has a single crossing point which can be
safely used; Luckily, a path to the goal is guaranteed to exist. This
environment is useful for studying safety and safe exploration.</p></li>
<li><p>otherwise - Similar to the <code class="docutils literal notranslate"><span class="pre">LavaCrossing</span></code> environment, the agent has to
reach the green goal square on the other corner of the room, however
lava is replaced by walls. This MDP is therefore much easier and maybe
useful for quickly testing your algorithms.</p></li>
</ul>
</section>
<section id="mission-space">
<h2>Mission Space<a class="headerlink" href="#mission-space" title="Permalink to this heading">#</a></h2>
<p>Depending on the <code class="docutils literal notranslate"><span class="pre">obstacle_type</span></code> parameter:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">Lava</span></code> - “avoid the lava and get to the green goal square”</p></li>
<li><p>otherwise - “find the opening and get to the green goal square”</p></li>
</ul>
</section>
<section id="action-space">
<h2>Action Space<a class="headerlink" href="#action-space" title="Permalink to this heading">#</a></h2>
<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>Name</p></th>
<th class="head"><p>Action</p></th>
</tr>
</thead>
<tbody>
<tr class="row-even"><td><p>0</p></td>
<td><p>left</p></td>
<td><p>Turn left</p></td>
</tr>
<tr class="row-odd"><td><p>1</p></td>
<td><p>right</p></td>
<td><p>Turn right</p></td>
</tr>
<tr class="row-even"><td><p>2</p></td>
<td><p>forward</p></td>
<td><p>Move forward</p></td>
</tr>
<tr class="row-odd"><td><p>3</p></td>
<td><p>pickup</p></td>
<td><p>Unused</p></td>
</tr>
<tr class="row-even"><td><p>4</p></td>
<td><p>drop</p></td>
<td><p>Unused</p></td>
</tr>
<tr class="row-odd"><td><p>5</p></td>
<td><p>toggle</p></td>
<td><p>Unused</p></td>
</tr>
<tr class="row-even"><td><p>6</p></td>
<td><p>done</p></td>
<td><p>Unused</p></td>
</tr>
</tbody>
</table>
</div>
</section>
<section id="observation-encoding">
<h2>Observation Encoding<a class="headerlink" href="#observation-encoding" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p>Each tile is encoded as a 3 dimensional tuple:
<code class="docutils literal notranslate"><span class="pre">(OBJECT_IDX,</span> <span class="pre">COLOR_IDX,</span> <span class="pre">STATE)</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">OBJECT_TO_IDX</span></code> and <code class="docutils literal notranslate"><span class="pre">COLOR_TO_IDX</span></code> mapping can be found in
<a class="reference internal" href="#minigrid/minigrid.py"><span class="xref myst">minigrid/minigrid.py</span></a></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">STATE</span></code> refers to the door state with 0=open, 1=closed and 2=locked</p></li>
</ul>
</section>
<section id="rewards">
<h2>Rewards<a class="headerlink" href="#rewards" title="Permalink to this heading">#</a></h2>
<p>A reward of ‘1 - 0.9 * (step_count / max_steps)’ is given for success, and ‘0’ for failure.</p>
</section>
<section id="termination">
<h2>Termination<a class="headerlink" href="#termination" title="Permalink to this heading">#</a></h2>
<p>The episode ends if any one of the following conditions is met:</p>
<ol class="arabic simple">
<li><p>The agent reaches the goal.</p></li>
<li><p>The agent falls into lava.</p></li>
<li><p>Timeout (see <code class="docutils literal notranslate"><span class="pre">max_steps</span></code>).</p></li>
</ol>
</section>
<section id="registered-configurations">
<h2>Registered Configurations<a class="headerlink" href="#registered-configurations" title="Permalink to this heading">#</a></h2>
<p>S: size of the map SxS.
N: number of valid crossings across lava or walls from the starting position
to the goal</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">Lava</span></code> :</p>
<ul>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-LavaCrossingS9N1-v0</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-LavaCrossingS9N2-v0</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-LavaCrossingS9N3-v0</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-LavaCrossingS11N5-v0</span></code></p></li>
</ul>
</li>
<li><p>otherwise :</p>
<ul>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-SimpleCrossingS9N1-v0</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-SimpleCrossingS9N2-v0</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-SimpleCrossingS9N3-v0</span></code></p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">MiniGrid-SimpleCrossingS11N5-v0</span></code></p></li>
</ul>
</li>
</ul>
</section>
</section>

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<li><a class="reference internal" href="#">Crossing</a><ul>
<li><a class="reference internal" href="#description">Description</a></li>
<li><a class="reference internal" href="#mission-space">Mission Space</a></li>
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