[SPARK-10835] [ML] Word2Vec should accept non-null string array, in addition to existing null string array#15179

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srowen:SPARK-10835

Commits on Sep 21, 2016

To match Tokenizer and for compatibility with Word2Vec, output a nullable string array type in NGram
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Commits on Sep 22, 2016

Let Word2Vec accept non-nullable string array input in additional to currently supported nullable string array type
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Commits on Sep 23, 2016

Add unit test
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