[SYSTEMDS-2686] Compressed overlapping column groups #1080
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This commit change the compressed right multiplication to perform in compressed space, resulting in significantly faster execution. The technique employed results in overlapping column groups, that contain partial results of the matrix multiplication. The downside is that some operations that previously was possible on compressed space no longer works, for the overlapping column groups. To still support all the operations, then decompression is used for cases where it is impossible to execute on the compressed matrices. Another addition is that statistics now contain compression and decompression times if compression is enabled. Furthermore the tests have been extended to include tests for the overlapping resulting in + 10000 tests in compression now.
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[SYSTEMDS-2686] Compressed overlapping column groups
This commit change the compressed right multiplication to perform in
compressed space, resulting in significantly faster execution.
The technique employed results in overlapping column groups, that contain
partial results of the matrix multiplication.
The downside is that some operations that previously was possible on
compressed space no longer works, for the overlapping column groups.
To still support all the operations, then decompression is used for
cases where it is impossible to execute on the compressed matrices.
Another addition is that statistics now contain compression and
decompression times if compression is enabled.