Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/17233#discussion_r105706598
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/feature/StringIndexer.scala ---
@@ -39,20 +39,21 @@ import org.apache.spark.util.collection.OpenHashMap
private[feature] trait StringIndexerBase extends Params with HasInputCol
with HasOutputCol {
/**
- * Param for how to handle unseen labels. Options are 'skip' (filter out
rows with
- * unseen labels), 'error' (throw an error), or 'keep' (put unseen
labels in a special additional
+ * Param for how to handle invalid data (unseen labels or NULL values).
+ * Options are 'skip' (filter out rows with invalid data),
+ * 'error' (throw an error), or 'keep' (put invalid data in a special
additional
* bucket, at index numLabels.
--- End diff --
Add ")" at end: "numLabels)."
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