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| author | Sean Owen <sowen@cloudera.com> | 2014-07-03 11:54:51 -0700 |
|---|---|---|
| committer | Xiangrui Meng <meng@databricks.com> | 2014-07-03 11:54:51 -0700 |
| commit | 2b36344f588d4e7357ce9921dc656e2389ba1dea (patch) | |
| tree | 6bf34b3c688579cf314df91932ef31745f39cf9b /mllib/src | |
| parent | c480537739f9329ebfd580f09c69778e6c976366 (diff) | |
| download | spark-2b36344f588d4e7357ce9921dc656e2389ba1dea.tar.gz spark-2b36344f588d4e7357ce9921dc656e2389ba1dea.tar.bz2 spark-2b36344f588d4e7357ce9921dc656e2389ba1dea.zip | |
SPARK-1675. Make clear whether computePrincipalComponents requires centered data
Just closing out this small JIRA, resolving with a comment change.
Author: Sean Owen <sowen@cloudera.com>
Closes #1171 from srowen/SPARK-1675 and squashes the following commits:
45ee9b7 [Sean Owen] Add simple note that data need not be centered for computePrincipalComponents
Diffstat (limited to 'mllib/src')
| -rw-r--r-- | mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala index 1a0073c9d4..695e03b736 100644 --- a/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala +++ b/mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala @@ -347,6 +347,8 @@ class RowMatrix( * The principal components are stored a local matrix of size n-by-k. * Each column corresponds for one principal component, * and the columns are in descending order of component variance. + * The row data do not need to be "centered" first; it is not necessary for + * the mean of each column to be 0. * * @param k number of top principal components. * @return a matrix of size n-by-k, whose columns are principal components |