Github user avulanov commented on the pull request: https://github.com/apache/spark/pull/1290#issuecomment-65264353 Just in case, I've tested the ANN without the hidden layer and it seems to work as multinomial regression, though with (one-half) squared-error cost function and without softmax output. One needs to pass an empty array `Array[Int]()` as a hidden layer parameter.
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