d="examples"><a class="anchor" href="#examples"></a>Examples</h2>
    <pre class="examples"><div class='input'><span class='no'>step</span> <span class='kw'>=</span> <span class='kw'>function</span>(<span class='no'>self</span>, <span class='no'>action</span>) {
  <span class='no'>state</span> <span class='kw'>=</span> <span class='fu'>list</span>(<span class='kw'>mean</span> <span class='kw'>=</span> <span class='no'>action</span> + <span class='fu'>rnorm</span>(<span class='fl'>1</span>), <span class='kw'