Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/12498#discussion_r60305377
--- Diff: mllib/src/main/scala/org/apache/spark/ml/feature/HashingTF.scala
---
@@ -63,7 +63,18 @@ class HashingTF(override val uid: String)
"This is useful for discrete probabilistic models that model binary
events rather " +
"than integer counts")
- setDefault(numFeatures -> (1 << 18), binary -> false)
+ /**
+ * The hash algorithm used when mapping term to integer.
+ * Supported options: "murmur3" and "native".
--- End diff --
Document that "native" is the hashing method used in Spark 1.6 and earlier.
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