zhengruifeng opened a new pull request #26439: [SPARK-29801][ML] ML models unify toString method URL: https://github.com/apache/spark/pull/26439 ### What changes were proposed in this pull request? ML models should extend toString method to expose basic information. Current some algs (GBT/RF/LoR) had done this, while others not yet. ### Why are the changes needed? ML models should extend toString method to expose basic information. ### Does this PR introduce any user-facing change? yes ### How was this patch tested? existing testsuites
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