 <span class="k">if</span> <span class="n">clazz</span> <span class="o">==</span> <span class="n">unknown_class_label</span> <span class="ow">or</span> <span class="n">clazz</span> <span class="o">==</span> <span class="n">empty_class_label</span><span class="p">:</span>
            <span class="k">continue</span>
        <span class="n">results</span><span class="o">.</span><span class="n">append</span><span class="p">(</span>
        <span class="n">pool</span><span class="o">.</span><span class="n">apply