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<h2>How are documents classified?</h2>
<div class="cell" data-hash="03-topic-models_cache/revealjs/unnamed-chunk-20_d950b10e3015585a4c2b7b9c57b52ad4">
<div class="sourceCode cell-code" id="cb18"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb18-1"><a href="#cb18-1"></a>chapters_parsed <span class="sc">%&gt;%</span></span>
<span id="cb18-2"><a href="#cb18-2"></a>    <span class="fu">mutate</span>(<span class="at">title =</span