srowen commented on a change in pull request #32734:
URL: https://github.com/apache/spark/pull/32734#discussion_r646222730
##########
File path:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
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@@ -438,8 +443,8 @@ class RowMatrix @Since("1.0.0") (
require(m > 1, s"RowMatrix.computeCovariance called on matrix with only $m
rows." +
" Cannot compute the covariance of a RowMatrix with <= 1 row.")
val mean = Vectors.fromML(summary.mean)
-
- if (rows.first().isInstanceOf[DenseVector]) {
+ // If all the rows are sparse vectors, then compute based on
`computeSparseVectorCovariance`.
+ if (!isSparseMatrix) {
computeDenseVectorCovariance(mean, n, m)
Review comment:
OK, I was going to say, why do we treat these two cases differently? but
the code already does. I think this is a better test, so I support the change.
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