span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">cat</span><span class="p">([</span><span class="n">not_dummy_points</span><span class="p">]</span> <span class="o">*</span> <span class="bp">self</span><span class="o">.</span><span class="n">n_elements</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>

        <span class="n">centers</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class=