'code'>
            <div class="highlight"><pre><span class="lineno">253</span>                <span class="n">tracker</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="s1">&#39;accuracy.valid&#39;</span><span class="p">,</span> <span class="n">accuracy</span><span class="p">(</span><span class="n">output</span><span class="p">[</span><span class="n">idx_valid</span><span class="p">],</span> <span class="n">labels</span><span class="p">[</span><span class="n">idx_v