   <span class="n">C_ij</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_pairwise_matrix</span><span class="p">(</span><span class="n">x_i</span><span class="p">,</span> <span class="n">y_j</span><span class="p">)</span>
                <span class="n">C_ij_dict</span><span class="p">[</span><span class="n">i</span><span class="p">,</span> <span class="n">j</span><span class="p">]</span> <span class="o">=</span> <span class="n">C_ij</span>

        <spa