an><span class="n">array</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">vertices</span><span class="p">))</span>
            <span class="k">return</span> <span class="n">np</span><span class="o">.</span><span class="n">linalg</span><span class="o">.</span><span class="n">matrix_rank</span><span class="p">(</span><span class="n">vertices</span><span class="p">[</span><span class="mi">1</span><span class="p">:]</span> <span class="o">-</span> <span class="n"