Github user MLnick commented on the issue:

    https://github.com/apache/spark/pull/13641
  
    @mengxr I thought more about the `UnaryTransformer` cases, and I actually 
don't think it's necessary to bump the annotations for the classes, just the 
public methods/vals exposing `Vector`. 
    
    I thought the concrete classes would be binary incompatible but I don't 
actually think that is the case - and I just tested this (master against commit 
immediately prior to e2efe05) and apart from `scalingVec` it is fine.
    
    I've created 
[SPARK-16127](https://issues.apache.org/jira/browse/SPARK-16127) to track 
further annotations that need updating related to new `ml.linalg` classes, and 
I think I will revert this particular change for `UnaryTransformer` classes in 
#13840.


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