Github user lw-lin commented on a diff in the pull request:
https://github.com/apache/spark/pull/14914#discussion_r77128029
--- Diff:
mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala ---
@@ -999,7 +999,7 @@ object Matrices {
val data = new ArrayBuffer[(Int, Int, Double)]()
dnMat.foreachActive { (i, j, v) =>
if (v != 0.0) {
- data.append((i, j + startCol, v))
+ data.+=((i, j + startCol, v))
--- End diff --
Writing it as `data += (i, j + startCol, v)` would yield compilation errors:
```
Too many arguments for methods =+(A)
Type mismatch, expected: (Int, Int, Double), actual: Int
```
thus here it written as `data.+=((i, j + startCol, v))`
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