Github user yinxusen commented on a diff in the pull request:
https://github.com/apache/spark/pull/14051#discussion_r69656311
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
---
@@ -537,7 +537,7 @@ class RowMatrix @Since("1.0.0") (
def tallSkinnyQR(computeQ: Boolean = false): QRDecomposition[RowMatrix,
Matrix] = {
val col = numCols().toInt
// split rows horizontally into smaller matrices, and compute QR for
each of them
- val blockQRs = rows.glom().map { partRows =>
+ val blockQRs = rows.retag(classOf[Vector]).glom().map { partRows =>
--- End diff --
I also tried other interfaces of RowMatrix, all work good:
```Java
JavaRDD<Vector> rows = jsc.parallelize(Arrays.asList(v1, v2, v3), 1);
Matrix dm = Matrices.dense(3, 2, new double[] {1.0, 3.0, 5.0, 2.0, 4.0,
6.0});
RowMatrix mat = new RowMatrix(rows.rdd());
mat.computeGramianMatrix();
mat.columnSimilarities();
mat.columnSimilarities(0.5);
mat.computeColumnSummaryStatistics();
mat.computeCovariance();
mat.computePrincipalComponents(1);
mat.computeSVD(1, false, 1e-9);
mat.toBreeze();
mat.rows();
mat.numCols();
mat.numRows();
mat.multiply(dm);
```
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