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SPARK-1675. Make clear whether computePrincipalComponents requires centered data #1171

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SPARK-1675. Make clear whether computePrincipalComponents requires centered data #1171

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2 changes: 2 additions & 0 deletions mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/RowMatrix.scala
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Expand Up @@ -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
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