Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12498#discussion_r60237569
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/feature/HashingTF.scala ---
@@ -54,20 +60,43 @@ class HashingTF(val numFeatures: Int) extends
Serializable {
}
/**
+ * Set the hash algorithm used when mapping term to integer.
+ * (default: murmur3)
+ */
+ @Since("2.0.0")
+ def setHashAlgorithm(value: String): this.type = {
+ hashAlgorithm = value
+ this
+ }
+
+ /**
* Returns the index of the input term.
*/
@Since("1.1.0")
+ @deprecated("Use indexOfTerm instead. This method will be removed in
2.1.0.", "2.0.0")
def indexOf(term: Any): Int = Utils.nonNegativeMod(term.##, numFeatures)
/**
+ * Returns the index of the input term by different hash algorithms.
+ */
+ @Since("2.0.0")
+ def indexOfTerm(hashAlgorithm: String)(term: Any): Int = {
--- End diff --
Why would the user pass the hash algorithm again here? you can store a
reference to a function from Any to Int when the hash algorithm is configured,
and not even have to look it up every time.
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