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[SPARK-31656][ML][PYSPARK] AFT blockify input vectors #28473
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Test build #122388 has finished for PR 28473 at commit
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Test build #122390 has finished for PR 28473 at commit
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testCode:
results:
When blockSize is set 256, it is 10X faster than existing impl. |
Test build #122426 has finished for PR 28473 at commit
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Merged to master |
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What changes were proposed in this pull request?
1, add new param blockSize;
2, add a new class InstanceBlock;
3, if blockSize==1, keep original behavior; if blockSize>1, stack input vectors to blocks (like ALS/MLP);
4, if blockSize>1, standardize the input outside of optimization procedure;
Why are the changes needed?
it will obtain performance gain on dense datasets, such as epsilon
1, reduce RAM to persist traing dataset; (save about 40% RAM)
2, use Level-2 BLAS routines; (~10X speedup)
Does this PR introduce any user-facing change?
Yes, a new param is added
How was this patch tested?
existing and added testsuites