Github user daniel-pape commented on a diff in the pull request:
https://github.com/apache/flink/pull/1078#discussion_r40507074
--- Diff:
flink-staging/flink-ml/src/main/scala/org/apache/flink/ml/math/SparseVector.scala
---
@@ -85,6 +85,34 @@ 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 otherIndices = other match {
+ case sv @ SparseVector(_, _, _) => sv.indices
+ case dv @ DenseVector(_) => (0 until dv.size).toArray
+ }
+
+ val entries = for {
+ i <- indices
+ j <- otherIndices
+ value = this(i) * other(j)
--- End diff --
Thanks for pointing this out.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
