[SPARK-9471] [ML] Multilayer Perceptron#7621

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avulanov wants to merge 9 commits intoapache:masterfrom

avulanov:SPARK-2352-ann

Commits on Jul 23, 2015

Commits on Jul 24, 2015

Addressing reviewers comments: unnecessary copy of data in predict
avulanov
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Commits on Jul 29, 2015

Addressing reviewers comments. Adding multiclass test.
avulanov
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Moving ANN to ML package. GradientDescent constructor is now spark private.
avulanov
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Commits on Jul 30, 2015

Commits on Jul 31, 2015

Addressing reviewers comments.
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