Github user srowen commented on the issue: https://github.com/apache/spark/pull/16194 Yes, it would be nicer to just have a default like `ClassName(uid=...)` at least. That however would not include the class-specific details like number of layers. I am neutral on whether that's so useful, but OK. At least, this should not say `@Since("2.1.0")` since it can only go in for 2.2.0
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