[SPARK-5128][MLLib] Add common used log1pExp API in MLUtils#3915

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dbtsai wants to merge 7 commits intoapache:masterfrom AlpineNow:mathutil

+37-21

Commits on Jan 7, 2015

first commit
DB Tsai
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address another overflow issue in gradientMultiplier in LOR gradient code
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formating
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temp
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doc
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revert part of patch into another PR
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remove empty line
DB Tsai
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