[SPARK-6793][SPARK-5567][SPARK-8936][MLlib]Perplexity, prediction, and hyperparameter optimization in OnlineLDAOptimizer#7507

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feynmanliang wants to merge 19 commits intoapache:masterfrom

feynmanliang:SPARK-5567-LDA-predict

Commits on Jul 16, 2015

Range slice, in-place update, reduce transposes
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Commits on Jul 17, 2015

Outer product for stats, revert Range slicing
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--amend
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Commits on Jul 18, 2015

Refactor methods into companion class
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Add logPerplexity, refactor variationalBound into a method
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Add predict method
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Commits on Jul 19, 2015

Add alpha hyperparameter update method
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Move predict methods into LDAModel
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Refactor prior parameters into LDA model
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Factor common methods into LDAUtils
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Add unit tests for perplexity and predict
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Add scaffolding for updateAlpha
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Style fix
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Commits on Jul 22, 2015

Merge branch 'master' into SPARK-5567-LDA-predict
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Commits on Jul 23, 2015

Integrate asymmetric alpha and model save-load
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Remove merge files
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Make alpha hyperparameter inference run, still fail test
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Commits on Jul 27, 2015

Pull out k in tests
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Working alpha hyperparameter test
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