Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/14150#discussion_r70821003
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/clustering/LDAOptimizer.scala ---
@@ -508,8 +508,9 @@ final class OnlineLDAOptimizer extends LDAOptimizer {
val weight = rho()
val N = gammat.rows.toDouble
val alpha = this.alpha.asBreeze.toDenseVector
- val logphat: BDM[Double] =
sum(LDAUtils.dirichletExpectation(gammat)(::, breeze.linalg.*)) / N
- val gradf = N * (-LDAUtils.dirichletExpectation(alpha) +
logphat.toDenseVector)
+ val logphat: BDV[Double] =
+ sum(LDAUtils.dirichletExpectation(gammat)(::, breeze.linalg.*)).t / N
+ val gradf = N * (-LDAUtils.dirichletExpectation(alpha) + logphat)
--- End diff --
Breeze 0.12 has changed the type of return value of ```DenseMatrix(::,
*)``` from ```DenseMatrix``` to ```Transpose[DenseVector]```, so we should make
corresponding change.
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