zhengruifeng opened a new pull request #27374: [SPARK-30659][ML][PYSPARK] LogisticRegression blockify input vectors URL: https://github.com/apache/spark/pull/27374 ### What changes were proposed in this pull request? 1, use blocks instead of vectors 2, use Level-2 BLAS for binary, use Level-3 BLAS for multinomial ### Why are the changes needed? 1, less RAM to persist training data; 2, faster than existing impl ### 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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