n><span class="o">.</span><span class="n">sum</span><span class="p">()</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">2</span><span class="p">)]))</span>
</pre></div>

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<h2 id="Sparse-Traini