Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/10152#discussion_r50671686
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala ---
@@ -556,6 +571,7 @@ class Word2VecModel private[spark] (
.sortBy(- _._2)
.take(num + 1)
.tail
+ .map(v => (if (vecNorm == 0) v else (v._1, v._2 / vecNorm)))
--- End diff --
@srowen if either of the vector norms are 0, the cosine similarity should
be 0. Though by definition I think here `v._2` will be 0 if the norm is 0, what
do you think about making this `if vecNorm == 0) 0 ...` to be explicit?
(follows what you did in
https://github.com/apache/spark/commit/94b39f7777ecff3794727c186bd681fa4c6af4fd#diff-88f4b62c382b26ef8e856b23f5167ccdR542)
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