Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/6228#discussion_r30621013
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala ---
@@ -158,6 +158,9 @@ class Word2Vec extends Serializable with Logging {
.sortWith((a, b) => a.cn > b.cn)
vocabSize = vocab.length
+ require(vocabSize > 0, "The vocabulary size should be large than 0.
You may need to check " +
--- End diff --
Yeah, this is real minor point of taste. I use `IllegalStateException` when
there's no real argument to speak of, which is marginally more specific and
description. But isn't this error caused by a bad input RDD?
`IllegalArgumentException` seems like just the thing.
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