Baunsgaard opened a new pull request #1483:
URL: https://github.com/apache/systemds/pull/1483


   This commit change row aggregates in compressed space to first aggregate
   the dictionaries into vectors, and then populating the output.
   This makes it reduce the number of floating point operations needed.
   
   In the worst dataset Infini-MNIST it half execution time from 100
   to 50 sec (uncompressed is at 8 sec) for 100 repetitions, and more
   importantly it reduce the number of instructions by 10x. Hopefully
   some better caching and threading will reduce it further in another
   commit.


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