="o">.</span><span class="n">rollback</span><span class="p">()</span>
            <span class="n">expval</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_decisiontree</span><span class="o">.</span><span class="n">_tree_nodes</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">_idx</span><span class="p">]</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s2">&quot;EV&qu