pan><span class="o">.</span><span class="n">arr</span>
                <span class="n">mean_val</span> <span class="o">+=</span> <span class="n">coef</span><span class="o">*</span><span class="n">tf</span><span class="o">.</span><span class="n">reduce_sum</span><span class="p">(</span>
                    <span class="n">tf</span><span class="o">.</span><span class="n">math</span><span class="o">.</span><span class="n">real</span><span class="p">(</span><span class="n">tf</span><span class="o">.</span><span