zhengruifeng opened a new pull request #27396: [SPARK-30660][ML][PYSPARK] LinearRegression blockify input vectors URL: https://github.com/apache/spark/pull/27396 ### What changes were proposed in this pull request? 1, use blocks instead of vectors for performance improvement 2, move standardization of input vectors outside of gradient computation ### Why are the changes needed? 1, less RAM to persist training data; (save ~40%) 2, faster than existing impl; (30% ~ 102%) ### Does this PR introduce any user-facing change? add a new expert param `blockSize` ### How was this patch tested? updated testsuites
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