Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/10152#discussion_r52141782
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/feature/Word2Vec.scala ---
@@ -289,26 +301,24 @@ class Word2Vec extends Serializable with Logging {
val expTable = sc.broadcast(createExpTable())
val bcVocab = sc.broadcast(vocab)
val bcVocabHash = sc.broadcast(vocabHash)
-
- val sentences: RDD[Array[Int]] = words.mapPartitions { iter =>
- new Iterator[Array[Int]] {
- def hasNext: Boolean = iter.hasNext
-
- def next(): Array[Int] = {
- val sentence = ArrayBuilder.make[Int]
- var sentenceLength = 0
- while (iter.hasNext && sentenceLength < MAX_SENTENCE_LENGTH) {
- val word = bcVocabHash.value.get(iter.next())
- word match {
- case Some(w) =>
- sentence += w
- sentenceLength += 1
- case None =>
+ // each partition is a collection of sentences,
+ // will be translated into arrays of Index integer
+ val sentences: RDD[Array[Int]] = dataset.mapPartitions {
+ // Each sentence will map to 0 or more Array[Int]
+ sentenceIter =>
--- End diff --
Generally I prefer the style:
```
dataset.mapPartitions { sentenceIter =>
sentenceIter.flatMap { sentence =>
...
```
I don't think it's a hard rule for Spark but most other code follows this
convention.
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