Github user Ishiihara commented on a diff in the pull request:

    https://github.com/apache/spark/pull/1932#discussion_r16222127
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala ---
    @@ -284,16 +284,15 @@ class Word2Vec extends Serializable with Logging {
         
         val newSentences = sentences.repartition(numPartitions).cache()
         val initRandom = new XORShiftRandom(seed)
    -    var syn0Global =
    -      Array.fill[Float](vocabSize * vectorSize)((initRandom.nextFloat() - 
0.5f) / vectorSize)
    -    var syn1Global = new Array[Float](vocabSize * vectorSize)
    -
    +    var synGlobal =
    --- End diff --
    
    We can keep syn0 and syn1, but it adds some unnecessary slicing operations 
on array. 


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