Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/17459#discussion_r109817581
--- Diff:
mllib/src/test/scala/org/apache/spark/mllib/linalg/distributed/IndexedRowMatrixSuite.scala
---
@@ -89,11 +89,19 @@ class IndexedRowMatrixSuite extends SparkFunSuite with
MLlibTestSparkContext {
test("toBlockMatrix") {
val idxRowMat = new IndexedRowMatrix(indexedRows)
+
+ // Tests when n % colsPerBlock != 0
--- End diff --
This only tests a `IndexedRowMatrix` consisted of `DenseVector`. We should
add another test to test the cases of `SparseVector` and the mix of them.
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