<span class="n">seed</span><span class="p">(</span><span class="n">seed</span><span class="p">)</span>

    <span class="k">if</span> <span class="n">add_unknown_class</span><span class="p">:</span>
        <span class="n">unknown_classes</span> <span class="o">=</span> <span class="n">_find_unknown_classes</span><span class="p">(</span><span class="n">classes</span><span class="p">,</span> <span class="n">directory</span><span class="p">)</span>
        <span class="k">if</span> <span class="nb">len</span>