Rewrite feed/fetch op #4815
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Rewrite feed/fetch op #4815
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* Feed/Fetch op just plain operator, not a OpWithKernel * Do not register OpInfoMaker since Feed/Fetch will never be configured by users * Feed/Fetch op has empty gradient * Feed/Fetch op do not hard code `feed_variable`, `fetch_variable` as its input and output, make it as a plain Operator input/output
wangkuiyi approved these changes Oct 16, 2017
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Fixes #4819