Baunsgaard opened a new pull request, #2504:
URL: https://github.com/apache/systemds/pull/2504

   Implement removeEmptyRows and removeEmptyCols for compressed matrices 
without full decompression. Add CLALibRemoveEmpty driver and LibMatrixReorg 
helpers (rmemptyEarlyAbort/rmemptyUnsafe), per-column-group 
removeEmptyRows/removeEmptyColsSubset, dictionary sliceColumns, and 
offset/mapping support for index-only row removal.


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