Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/12498#discussion_r60305525
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/feature/HashingTF.scala ---
@@ -97,3 +126,41 @@ class HashingTF(val numFeatures: Int) extends
Serializable {
dataset.rdd.map(this.transform).toJavaRDD()
}
}
+
+object HashingTF {
+
+ private[spark] val Native: String = "native"
+
+ private[spark] val Murmur3: String = "murmur3"
+
+ private[spark] val supportedHashAlgorithms = Set(Native, Murmur3)
+
+ private val seed = 42
+
+ /**
+ * Calculate a hash code value for the term object using the native
Scala implementation.
+ */
+ private[spark] def nativeHash(term: Any): Int = term.##
+
+ /**
+ * Calculate a hash code value for the term object using
+ * Austin Appleby's MurmurHash 3 algorithm (MurmurHash3_x86_32).
--- End diff --
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