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<section id="decoding">
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<span id="dummies-tutorial-decoding"></span><h1>Decoding<a class="headerlink" href="#decoding" title="Permalink to this heading"></a></h1>
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<p>After <a class="reference internal" href="training.html#dummies-tutorial-training"><span class="std std-ref">Training</span></a>, we can start decoding.</p>
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<p>The command to start the decoding is quite simple:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span><span class="nb">cd</span><span class="w"> </span>/tmp/icefall
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<span class="nb">export</span><span class="w"> </span><span class="nv">PYTHONPATH</span><span class="o">=</span>/tmp/icefall:<span class="nv">$PYTHONPATH</span>
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<span class="nb">cd</span><span class="w"> </span>egs/yesno/ASR
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<span class="c1"># We use CPU for decoding by setting the following environment variable</span>
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<span class="nb">export</span><span class="w"> </span><span class="nv">CUDA_VISIBLE_DEVICES</span><span class="o">=</span><span class="s2">""</span>
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./tdnn/decode.py
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</pre></div>
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<p>The output logs are given below:</p>
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<section id="for-the-more-curious">
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<h2>For the more curious<a class="headerlink" href="#for-the-more-curious" title="Permalink to this heading"></a></h2>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>./tdnn/decode.py<span class="w"> </span>--help
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</pre></div>
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<p>will print the usage information about <code class="docutils literal notranslate"><span class="pre">./tdnn/decode.py</span></code>. For instance, you
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can specify:</p>
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<blockquote>
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<div><ul class="simple">
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<li><p><code class="docutils literal notranslate"><span class="pre">--epoch</span></code> to use which checkpoint for decoding</p></li>
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<li><p><code class="docutils literal notranslate"><span class="pre">--avg</span></code> to select how many checkpoints to use for model averaging</p></li>
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</ul>
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</div></blockquote>
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<p>You usually try different combinations of <code class="docutils literal notranslate"><span class="pre">--epoch</span></code> and <code class="docutils literal notranslate"><span class="pre">--avg</span></code> and select
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one that leads to the lowest WER (<a class="reference external" href="https://en.wikipedia.org/wiki/Word_error_rate">Word Error Rate</a>).</p>
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