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<section id="two-approaches">
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<h1>Two approaches<a class="headerlink" href="#two-approaches" title="Permalink to this heading"></a></h1>
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<p>Two approaches for FST-based forced alignment will be described:</p>
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<blockquote>
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<div><ul class="simple">
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<li><p><a class="reference external" href="https://github.com/kaldi-asr/kaldi">Kaldi</a>-based</p></li>
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<li><p><a class="reference external" href="https://github.com/k2-fsa/k2">k2</a>-based</p></li>
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</ul>
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<p>Note that the <a class="reference external" href="https://github.com/kaldi-asr/kaldi">Kaldi</a>-based approach does not depend on <a class="reference external" href="https://github.com/kaldi-asr/kaldi">Kaldi</a> at all.
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That is, you don’t need to install <a class="reference external" href="https://github.com/kaldi-asr/kaldi">Kaldi</a> in order to use it. Instead,
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we use <a class="reference external" href="https://github.com/k2-fsa/kaldi-decoder">kaldi-decoder</a>, which has ported the C++ decoding code from <a class="reference external" href="https://github.com/kaldi-asr/kaldi">Kaldi</a>
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without depending on it.</p>
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<section id="differences-between-the-two-approaches">
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<h2>Differences between the two approaches<a class="headerlink" href="#differences-between-the-two-approaches" title="Permalink to this heading"></a></h2>
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<p>The following table compares the differences between the two approaches.</p>
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<table class="docutils align-default">
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<tbody>
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<tr class="row-odd"><td><p>Features</p></td>
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<td><p><a class="reference external" href="https://github.com/kaldi-asr/kaldi">Kaldi</a>-based</p></td>
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<td><p><a class="reference external" href="https://github.com/k2-fsa/k2">k2</a>-based</p></td>
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</tr>
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<tr class="row-even"><td><p>Support CUDA</p></td>
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<td><p>No</p></td>
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<td><p>Yes</p></td>
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</tr>
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<tr class="row-odd"><td><p>Support CPU</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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</tr>
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<tr class="row-even"><td><p>Support batch processing</p></td>
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<td><p>No</p></td>
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<td><p>Yes on CUDA; No on CPU</p></td>
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</tr>
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<tr class="row-odd"><td><p>Support streaming models</p></td>
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<td><p>Yes</p></td>
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<td><p>No</p></td>
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</tr>
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<tr class="row-even"><td><p>Support C++ APIs</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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</tr>
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<tr class="row-odd"><td><p>Support Python APIs</p></td>
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<td><p>Yes</p></td>
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<td><p>Yes</p></td>
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</tr>
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</tbody>
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</table>
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