"fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> 
                    <span class="n">T</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">root</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span>
                    <span class="n">f</span> <span class="o">=</span> <span class="p">{},</span> 
                    <span class="n">labels</span> <span class="o">=</span> <span class=