Github user marcovivero commented on the issue: https://github.com/apache/incubator-predictionio-template-text-classifier/issues/4 You're right they're not currently being used in the engine. You can add these in easily as they're an element of `TrainingData` case class. Just modify the `TFHasher` class to take the stopwords as an input parameter, and apply the appropriate filter here: https://github.com/apache/incubator-predictionio-template-text-classifier/blob/master/src/main/scala/Preparator.scala#L68 You can subsequently pass in the stopwords here: https://github.com/apache/incubator-predictionio-template-text-classifier/blob/master/src/main/scala/Preparator.scala#L29
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