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### What changes were proposed in this pull request? 1,ML models should extend toString method to expose basic information. Current some algs (GBT/RF/LoR) had done this, while others not yet. 2,add `val numFeatures` in `BisectingKMeansModel`/`GaussianMixtureModel`/`KMeansModel`/`AFTSurvivalRegressionModel`/`IsotonicRegressionModel` ### 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 Closes #26439 from zhengruifeng/models_toString. Authored-by: zhengruifeng <ruifengz@foxmail.com> Signed-off-by: Dongjoon Hyun <dhyun@apple.com> |
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