Github user WeichenXu123 commented on the issue:

    https://github.com/apache/spark/pull/14156
  
    @srowen yeah, the function supplied here called cannot be turned into SIMD 
instructions but I think it can do some parallelization optimization on large 
matrix, for example we can split the matrix into several blocks and executed 
the "in place transform" in parallel way, although it haven't added in breeze 
currently.


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