       <span class="n">y_c</span> <span class="o">=</span> <span class="n">y</span><span class="p">[:,</span> <span class="n">c</span><span class="p">]</span>

        <span class="c1"># stft</span>
        <span class="n">X</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">stft</span><span class="p">(</span><span class="n">x_c</span><span class="p">,</span> <span class="n">ana_hop</span><span class="o">=</span><