[MLlib] [SPARK-2510]Word2Vec: Distributed Representation of Words#1719

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Commits on Aug 1, 2014

initial commit
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Add comments, minor fixes
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minor fix
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code formatting
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Commits on Aug 2, 2014

modify according to feedback
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Add test for Word2Vec algorithm, minor fixes
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Commits on Aug 3, 2014

add multiple iteration support
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use broadcast version of vocab in aggregate
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use weighted sum in combOp
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Commits on Aug 4, 2014