<span class="o">.</span><span class="n">TopkDF</span><span class="o">.</span><span class="n">shape</span><span class="p">[</span><span class="mi">1</span><span class="p">]:</span>
            <span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">&quot;TrainDF and TopkDF must have the same number of columns after slicing.&quot;</span><span class="p">)</span>

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