Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19078#discussion_r135749198
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/feature/PCA.scala ---
@@ -44,6 +44,13 @@ class PCA @Since("1.4.0") (@Since("1.4.0") val k: Int) {
require(k <= numFeatures,
s"source vector size $numFeatures must be no less than k=$k")
+ val workSize = ( 3
--- End diff --
I know it's copied from Breeze, but this is pretty unreadable and
duplicates code. It's a bit fragile too. This doesn't really help, it just
causes a different exception to be thrown.
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