Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1078#discussion_r45615952
--- Diff:
flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/math/SparseVector.scala
---
@@ -85,6 +86,39 @@ case class SparseVector(
}
}
+ /** Returns the outer product (a.k.a. Kronecker product) of `this`
+ * with `other`. The result is given in
[[org.apache.flink.ml.math.SparseMatrix]]
+ * representation.
+ *
+ * @param other a Vector
+ * @return the [[org.apache.flink.ml.math.SparseMatrix]] which equals
the outer product of `this`
+ * with `other.`
+ */
+ override def outer(other: Vector): SparseMatrix = {
+ val numRows = size
+ val numCols = other.size
+
+ val entries = other match {
+ case sv @ SparseVector(_, _, _) =>
+ for {
+ i <- indices
+ j <- sv.indices
+ value = data(indices.indexOf(i)) * sv.data(sv.indices.indexOf(j))
--- End diff --
`zipWithIndex` to avoid search in `indices` for `i` and `j`.
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