[SPARK-14891][ML] Add schema validation for ALS#12762

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MLnick wants to merge 11 commits intoapache:masterfrom

MLnick:SPARK-14891-als-validate-schema

Commits on May 16, 2016

Intial work
Nick Pentreath
committed
Improve tests and add transform test cases + small cleanup
Nick Pentreath
committed
revert small erroneous addition
Nick Pentreath
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user/item col param docs
Nick Pentreath
committed
indentation and unused val
Nick Pentreath
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user/item col cast to DoubleType before checkedCast
Nick Pentreath
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Fix erroneous indentation change
Nick Pentreath
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update to SparkSession
Nick Pentreath
committed
Get rid of unnecessary generic test method for ALS
Nick Pentreath
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test using float
Nick Pentreath
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Update user/item col doc (also in PySpark)
Nick Pentreath
committed