zhengruifeng commented on issue #26439: [SPARK-29801][ML] ML models unify toString method URL: https://github.com/apache/spark/pull/26439#issuecomment-551663482 For example, KMeansModel.toString should expose some basice information like LoR, but it only contains Estimator's uid now. ```scala scala> val kmeans = new KMeans().setK(2).setSeed(1L) kmeans: org.apache.spark.ml.clustering.KMeans = kmeans_4d760be410ff scala> val kmeans_model = kmeans.fit(dataset) kmeans_model: org.apache.spark.ml.clustering.KMeansModel = kmeans_4d760be410ff scala> val lr = new LogisticRegression().setMaxIter(1) lr: org.apache.spark.ml.classification.LogisticRegression = logreg_6523109640c2 scala> val lrm = lr.fit(dataset) lrm: org.apache.spark.ml.classification.LogisticRegressionModel = LogisticRegressionModel: uid = logreg_6523109640c2, numClasses = 6, numFeatures = 3 ```
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