Github user shivaram commented on the pull request: https://github.com/apache/spark/pull/3637#issuecomment-72410436 @mengxr - Would the Attribute be per data point or something that is set once per the algorithm ? The latter sounds like something the `ParamMap` should be able to handle. If its per element, then its like another column in the table ? Sorry if I missing something, but it'll be great if you could give an example
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