Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/11989#discussion_r58402045
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/treeParams.scala ---
@@ -343,6 +343,8 @@ private[ml] trait RandomForestParams extends
TreeEnsembleParams {
* - "onethird": use 1/3 of the features
* - "sqrt": use sqrt(number of features)
* - "log2": use log2(number of features)
+ * - "(0.0-1.0]": use the specified fraction of features
+ * - "[1-n]": use the specified number of features
--- End diff --
This note is a bit confusing. It isn't clear what n is and we don't mention
that it should be smaller than `(number of features)`. I can't think of a great
wording for this that is also concise. One option:
`"n": use n features, for integer 0 < n <= (number of features)`
I'm open to better wordings.
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