44563a0412
### What changes were proposed in this pull request? There were a lot of works on improving ALS's recommendForAll For now, I found that it maybe futhermore optimized by 1, using GEMV and sharing a pre-allocated buffer per task; 2, using guava.ordering instead of BoundedPriorityQueue; ### Why are the changes needed? In my test, using `f2jBLAS.sgemv`, it is about 2.3X faster than existing impl. |Impl| Master | GEMM | GEMV | GEMV + array aggregator | GEMV + guava ordering + array aggregator | GEMV + guava ordering| |------|----------|------------|----------|------------|------------|------------| |Duration|341229|363741|191201|189790|148417|147222| ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? existing testsuites Closes #30468 from zhengruifeng/als_rec_opt. Authored-by: zhengruifeng <ruifengz@foxmail.com> Signed-off-by: Sean Owen <srowen@gmail.com> |
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