Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/661#discussion_r12389263
--- Diff:
mllib/src/test/scala/org/apache/spark/mllib/linalg/BreezeVectorConversionSuite.scala
---
@@ -55,4 +55,16 @@ class BreezeVectorConversionSuite extends FunSuite {
assert(vec.indices.eq(indices), "should not copy data")
assert(vec.values.eq(values), "should not copy data")
}
+
+ test("sparse breeze by vector builder to vector") {
--- End diff --
To ensure we can convert BSV to SparseVector correctly when there are used
elements, we should use
https://github.com/scalanlp/breeze/blob/master/math/src/main/scala/breeze/linalg/SparseVector.scala#L54
with `activeSize < index.length`.
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