 the separation between training and top-k data points.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="n">combined</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">vstack</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">TrainDF</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">TopkDF</span><span class="p">])</span>
        <span cl