Github user danielyli commented on a diff in the pull request:
https://github.com/apache/spark/pull/17793#discussion_r114044512
--- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
---
@@ -910,26 +944,127 @@ object ALS extends DefaultParamsReadable[ALS] with
Logging {
private type FactorBlock = Array[Array[Float]]
/**
- * Out-link block that stores, for each dst (item/user) block, which src
(user/item) factors to
- * send. For example, outLinkBlock(0) contains the local indices (not
the original src IDs) of the
- * src factors in this block to send to dst block 0.
+ * Out-link blocks that store information about which columns of the
items factor matrix are
--- End diff --
I like this. I'll add something to this effect in a bit.
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