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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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<article role="main">
<section id="mujoco">
<h1>MuJoCo<a class="headerlink" href="#mujoco" title="Permalink to this heading">#</a></h1>
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<span>Ant</span>
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<span>Half Cheetah</span>
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<a href="hopper">
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<span>Hopper</span>
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<span>Swimmer</span>
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<p>MuJoCo stands for Multi-Joint dynamics with Contact. It is a physics engine for facilitating research and development in robotics, biomechanics, graphics and animation, and other areas where fast and accurate simulation is needed.</p>
<p>The unique dependencies for this set of environments can be installed via:</p>
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>gymnasium<span class="o">[</span>mujoco<span class="o">]</span>
</pre></div>
</div>
<p>These environments also require that the MuJoCo engine be installed. As of October 2021 DeepMind has acquired MuJoCo and is open-sourcing it in 2022, making it free for everyone. Instructions on installing the MuJoCo engine can be found on their <a class="reference external" href="https://mujoco.org">website</a> and <a class="reference external" href="https://github.com/deepmind/mujoco">GitHub repository</a>. Using MuJoCo with Gymnasium also requires that the framework <code class="docutils literal notranslate"><span class="pre">mujoco</span></code> be installed (this dependency is installed with the above command).</p>
<p>For MuJoCo V3 environments and older the <code class="docutils literal notranslate"><span class="pre">mujoco-py</span></code> framework is required (<code class="docutils literal notranslate"><span class="pre">pip</span> <span class="pre">install</span> <span class="pre">mujoco-py</span></code>) which can be found in the <a class="reference external" href="https://github.com/openai/mujoco-py/tree/master/mujoco_py">GitHub repository</a></p>
<p>There are eleven Mujoco environments: Ant, HalfCheetah, Hopper, Humanoid, HumanoidStandup, InvertedDoublePendulum, InvertedPendulum, Pusher, Reacher, Swimmer, and Walker2d. All of these environments are stochastic in terms of their initial state, with a Gaussian noise added to a fixed initial state in order to add stochasticity. The state spaces for MuJoCo environments in Gymnasium consist of two parts that are flattened and concatenated together: a position of a body part (’<em>mujoco-py.mjsim.qpos</em>’) or joint and its corresponding velocity (’<em>mujoco-py.mjsim.qvel</em>’). Often, some of the first positional elements are omitted from the state space since the reward is calculated based on their values, leaving it up to the algorithm to infer those hidden values indirectly.</p>
<p>Among Gymnasium environments, this set of environments can be considered as more difficult ones to solve by a policy.</p>
<p>Environments can be configured by changing the XML files or by tweaking the parameters of their classes.</p>
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}
))
const ulElem = Object.assign(document.createElement('ul'),
{
className:'farama-header-menu-list',
}
)
for (let project of projects) {
const liElem = document.createElement("li");
const aElem = Object.assign(document.createElement("a"),
{
href: project.link
}
);
liElem.appendChild(aElem);
if (key !== "Foundation") {
const imgElem = Object.assign(document.createElement("img"),
{
src: project.image ? imagesBasepath + project.image : imagesBasepath + "/farama_black.svg",
alt: `${project.name} logo`,
className: "farama-black-logo-invert"
}
);
aElem.appendChild(imgElem);
}
aElem.appendChild(document.createTextNode(project.name));
ulElem.appendChild(liElem);
}
sectionElem.appendChild(ulElem);
menuContainer.appendChild(sectionElem)
});
}
xhr.onerror = function() {
console.error("Unable to load projects");
};
xhr.send();
</script>
<script>
const versioningConfig = {
githubUser: 'Farama-Foundation',
githubRepo: 'Gymnasium',
};
fetch('/main/_static/versioning/versioning_menu.html').then(response => {
if (response.status === 200) {
response.text().then(text => {
const container = document.createElement("div");
container.innerHTML = text;
document.querySelector("body").appendChild(container);
// innerHtml doenst evaluate scripts, we need to add them dynamically
Array.from(container.querySelectorAll("script")).forEach(oldScript => {
const newScript = document.createElement("script");
Array.from(oldScript.attributes).forEach(attr => newScript.setAttribute(attr.name, attr.value));
newScript.appendChild(document.createTextNode(oldScript.innerHTML));
oldScript.parentNode.replaceChild(newScript, oldScript);
});
});
} else {
console.warn("Unable to load versioning menu", response);
}
});
</script>
</body>
</html>
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