Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/15593#discussion_r86434451
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
---
@@ -489,13 +485,14 @@ class LogisticRegression @Since("1.2.0") (
val initialCoefWithInterceptArray =
initialCoefficientsWithIntercept.toArray
val providedCoef = optInitialModel.get.coefficientMatrix
providedCoef.foreachActive { (row, col, value) =>
- val flatIndex = row * numFeaturesPlusIntercept + col
+ // convert matrix to column major for training
--- End diff --
There are unit tests for it. Also, this is used in the old mllib code,
which exposed an initial model but wraps ML now.
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