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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2015/11/23 16:25:11 UTC
[jira] [Commented] (FLINK-1737) Add statistical whitening
transformation to machine learning library
[ https://issues.apache.org/jira/browse/FLINK-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15022258#comment-15022258 ]
ASF GitHub Bot commented on FLINK-1737:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1078#discussion_r45615350
--- Diff: flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/math/DenseVector.scala ---
@@ -102,6 +102,38 @@ case class DenseVector(
}
}
+ /** Returns the outer product (a.k.a. Kronecker product) of `this`
+ * with `other`. The result will given in [[org.apache.flink.ml.math.SparseMatrix]]
+ * representation if `other` is sparse and as [[org.apache.flink.ml.math.DenseMatrix]] otherwise.
+ *
+ * @param other a Vector
+ * @return the [[org.apache.flink.ml.math.Matrix]] which equals the outer product of `this`
+ * with `other.`
+ */
+ override def outer(other: Vector): Matrix = {
+ val numRows = size
+ val numCols = other.size
+
+ other match {
+ case sv @ SparseVector(_, _, _) =>
--- End diff --
you can write `casesv: SparseVector =>`
> Add statistical whitening transformation to machine learning library
> --------------------------------------------------------------------
>
> Key: FLINK-1737
> URL: https://issues.apache.org/jira/browse/FLINK-1737
> Project: Flink
> Issue Type: New Feature
> Components: Machine Learning Library
> Reporter: Till Rohrmann
> Assignee: Daniel Pape
> Labels: ML, Starter
>
> The statistical whitening transformation [1] is a preprocessing step for different ML algorithms. It decorrelates the individual dimensions and sets its variance to 1.
> Statistical whitening should be implemented as a {{Transfomer}}.
> Resources:
> [1] [http://en.wikipedia.org/wiki/Whitening_transformation]
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