e_value</span><span class="p">)</span> <span class="o">*</span> <span class="n">square</span><span class="p">(</span><span class="n">prediction</span><span class="p">)</span> <span class="o">+</span> <span class="n">true_value</span> <span class="o">*</span> <span class="n">square</span><span class="p">(</span> <span class="nb">max</span><span class="p">(</span><span class="n">margin</span><span class="o">-</span><span class="n">prediction</span><span class="p">,</span> <span class="mi">0</span><span class=