zhengruifeng opened a new pull request #25671: [SPARK-28968][ML] Add HasNumFeatures in the scala side URL: https://github.com/apache/spark/pull/25671 ### What changes were proposed in this pull request? Add HasNumFeatures in the scala side, with `1<<18` as the default value ### Why are the changes needed? HasNumFeatures is already added in the py side, it is reasonable to keep them in sync. I don't find other similar place. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Existing testsuites
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