tree 5c5fcaab53a424453bc4d3403ec5e661d4bb5870
parent 461ee22559106130ead12f8b5fc1fb2aa0c4f6f8
author baunsgaard <baunsgaard@tugraz.at> 1602591246 +0200
committer baunsgaard <baunsgaard@tugraz.at> 1603100067 +0200

[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.

Furthermore the tests have been extended to include tests for the
overlapping resulting in + 10000 tests in compression now.