utCol(<span class="lit">"sentence"</span>)

<span class="kw">val</span> token = <span class="kw">new</span> Tokenizer()
  .setInputCols(<span class="lit">"sentence"</span>)
  .setOutputCol(<span class="lit">"token"</span>)
  .setContextChars(<span class="std">Array</span>(<span class="lit">"("</span>, <span class="lit">")"</span>, <span class="lit">"?"</span>, <span class="lit">"!"</span>, <span class="lit">"."</span>, <span class="lit">","</span>))

<span class="kw">val</span> keywords = <span class="kw">n