Github user yongtang commented on a diff in the pull request: https://github.com/apache/spark/pull/11989#discussion_r58481526 --- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/treeParams.scala --- @@ -360,7 +362,8 @@ private[ml] trait RandomForestParams extends TreeEnsembleParams { "The number of features to consider for splits at each tree node." + s" Supported options: ${RandomForestParams.supportedFeatureSubsetStrategies.mkString(", ")}", (value: String) => - RandomForestParams.supportedFeatureSubsetStrategies.contains(value.toLowerCase)) + RandomForestParams.supportedFeatureSubsetStrategies.contains(value.toLowerCase) + || value.matches("^(?:[1-9]\\d*|0\\.\\d*[1-9]\\d*\\d*|1\\.0+)$")) --- End diff -- Oh the `\\d*\\d*` was a typo. I didn't notice that there are two `\\d*`s. Sorry about that. Let me update the pull request accordingly.
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