zhengruifeng commented on a change in pull request #31394:
URL: https://github.com/apache/spark/pull/31394#discussion_r568419326
##########
File path:
mllib/src/main/scala/org/apache/spark/ml/feature/BucketedRandomProjectionLSH.scala
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@@ -97,7 +97,19 @@ class BucketedRandomProjectionLSHModel private[ml](
@Since("2.1.0")
override protected[ml] def hashDistance(x: Seq[Vector], y: Seq[Vector]):
Double = {
// Since it's generated by hashing, it will be a pair of dense vectors.
- x.zip(y).map(vectorPair => Vectors.sqdist(vectorPair._1,
vectorPair._2)).min
+ // Currently each hash vector (generated by hashFunction) only has one
element, this equals to:
Review comment:
It is possible that a hash vector has length>1, but in current impl
(since 2.1), each vector has only one value.
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