GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/13643
[SPARK-15922][MLLIB] `toIndexedRowMatrix` should consider the case `cols <
colsPerBlock`
## What changes were proposed in this pull request?
SPARK-15922 reports the following scenario throwing an exception due to the
mismatched vector sizes. This PR handles the exceptional case, `cols <
colsPerBlock`.
**Before**
```scala
scala> import org.apache.spark.mllib.linalg.distributed._
scala> import org.apache.spark.mllib.linalg._
scala> val rows = IndexedRow(0L, new DenseVector(Array(1,2,3))) ::
IndexedRow(1L, new DenseVector(Array(1,2,3))):: IndexedRow(2L, new
DenseVector(Array(1,2,3))):: Nil
scala> val rdd = sc.parallelize(rows)
scala> val matrix = new IndexedRowMatrix(rdd, 3, 3)
scala> val bmat = matrix.toBlockMatrix
scala> val imat = bmat.toIndexedRowMatrix
scala> imat.rows.collect
... throw exception
```
**After**
```scala
...
scala> imat.rows.collect
res0: Array[org.apache.spark.mllib.linalg.distributed.IndexedRow] =
Array(IndexedRow(0,[1.0,2.0,3.0]), IndexedRow(1,[1.0,2.0,3.0]),
IndexedRow(2,[1.0,2.0,3.0]))
```
## How was this patch tested?
Pass the Jenkins tests (including the above case)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-15922
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13643.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13643
----
commit 85054becae5eb0075620bd674d534ea27a9268b5
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-06-13T18:28:05Z
[SPARK-15922][MLLIB] `toIndexedRowMatrix` should consider the case `cols <
colsPerBlock`
----
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