Github user tmyklebu commented on a diff in the pull request:
https://github.com/apache/spark/pull/493#discussion_r12213255
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/recommendation/ALS.scala ---
@@ -708,6 +709,113 @@ object ALS {
trainImplicit(ratings, rank, iterations, 0.01, -1, 1.0)
}
+ /**
+ * :: DeveloperApi ::
+ * Represents the cost attributable to a partition of a single ALS
iteration.
+ */
+ @DeveloperApi
+ case class IterationCost(inboundVectors: Double, outerProducts: Double,
choleskies: Double,
--- End diff --
`outerProducts` is the number of outer products you accumulate to form the
subproblem. I could change `choleskies` to the vague `subproblems`, but yeah.
`n` seems worse.
I could go with `quadratic` and `cubic`, but that's even more of a lie.
Probably leave this as is unless I think of a more inspiring name.
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