[SYSTEMDS-2748] TSMM Compressed Optimize#1177
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Baunsgaard wants to merge 1 commit intoapache:masterfrom
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[SYSTEMDS-2748] TSMM Compressed Optimize#1177Baunsgaard wants to merge 1 commit intoapache:masterfrom
Baunsgaard wants to merge 1 commit intoapache:masterfrom
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This commit optimize the transpose self matrix multiplication in compressed space. There are a few key upgrades - We avoid calculating the lower triangle of the output (~50% improvement) - The parallelization scheme is containing equal number of elements, since only the upper triangle have to calculated, this means that the same task is tasked with a row and the reflected row, reflected in the middle row of the matrix. (no tailing tasks giving full cpu util) - Second the diagonal is calculated without decompression, since the diagonal values can be computed without decompression by simply multiplying the dictionary entries. This makes tsmm, on single colGroup matrices many times faster than normal tsmm. (exploit cocode)
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