Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/17940#discussion_r117592116
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
---
@@ -992,7 +992,16 @@ object Matrices {
new DenseMatrix(dm.rows, dm.cols, dm.data, dm.isTranspose)
case sm: BSM[Double] =>
// There is no isTranspose flag for sparse matrices in Breeze
- new SparseMatrix(sm.rows, sm.cols, sm.colPtrs, sm.rowIndices,
sm.data)
+ val nsm = if (sm.rowIndices.length > sm.activeSize) {
+ // This sparse matrix has trainling zeros.
--- End diff --
trailing
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