Fix elementwise_gradient bug#10150

Merged

chengduoZH merged 2 commits intoPaddlePaddle:developfrom

chengduoZH:fix_elementwise_gradient

Apr 24, 2018

Commits on Apr 24, 2018

fix elementwise_grad op kernel and add unit test
chengduoZH
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Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into fix_elementwise_gradient
chengduoZH
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