Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/597#discussion_r12334516
--- Diff:
examples/src/main/scala/org/apache/spark/examples/mllib/MovieLensALS.scala ---
@@ -88,7 +92,11 @@ object MovieLensALS {
val ratings = sc.textFile(params.input).map { line =>
val fields = line.split("::")
- Rating(fields(0).toInt, fields(1).toInt, fields(2).toDouble)
+ if (params.implicitPrefs) {
+ Rating(fields(0).toInt, fields(1).toInt, fields(2).toDouble - 2.5)
--- End diff --
Could you summarize our discussion and put a comment here explaining why we
use `- 2.5`?
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