Github user zhengruifeng commented on the issue:
https://github.com/apache/spark/pull/16194
@srowen Ok, I will update the version. @hhbyyh as Owen said, if we add a
`toString` in class `Model`, we still need to override it in most algs if we
want to output some specific info: for example, current
`DecisionTreeClassifier` will output the depth and the number of nodes.
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