an>
<span class="sd">    &quot;&quot;&quot;</span>
    <span class="n">size_arr</span> <span class="o">=</span> <span class="n">obs</span><span class="o">.</span><span class="n">shape</span>
    <span class="n">len_arr</span> <span class="o">=</span> <span class="n">size_arr</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
    <span class="n">cac</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span