Support pure fp16 training for AMP API.#29544

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wzzju merged 19 commits intoPaddlePaddle:developfrom

wzzju:add_o2_api

Jan 8, 2021

Commits on Jan 5, 2021

Commits on Jan 6, 2021

Commits on Jan 7, 2021

Change for fp16 testing if users have the infer program defined in separate way.
wzzju
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Merge branch 'develop' of https://github.com/PaddlePaddle/Paddle into add_o2_api
wzzju
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