n class="n">i</span><span class="p">,</span><span class="w"> </span><span class="n">j</span><span class="p">)</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="p">&amp;</span>
<span class="w">                                        </span><span class="nb">dot_product</span><span class="p">(</span><span class="n">L</span><span class="p">(</span><span class="n">i</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">:</span><spa