iv class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">scivae</span> <span class="kn">import</span> <span class="n">Vis</span>

<span class="n">vis</span> <span class="o">=</span> <span class="n">Vis</span><span class="p">(</span><span class="n">vae</span><span class="p">,</span> <span class="n">vae</span><span class="o">.</span><span class="n">u</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="n">vis</span><span class="o">.</spa