"nd">@abstractmethod</span>
    <span class="k">def</span> <span class="nf">step_async</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">actions</span><span class="p">):</span>
<span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Tell all the environments to start taking a step</span>
<span class="sd">        with the given actions.</span>
<span class="sd">        Call step_wait() to get the results of the step.</