[Cherry-Pick] Support pure fp16 training for AMP API. (#29544)#30241

Merged

lanxianghit merged 3 commits intoPaddlePaddle:release/2.0from

wzzju:pure_fp16_2.0

Jan 11, 2021

Commits on Jan 8, 2021

Support pure fp16 training for AMP API. (#29544)
wzzju
committed

Commits on Jan 11, 2021

Remove tensor copy in the update_loss_scaling op. (#29426)
wzzju
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Merge branch 'release/2.0' of https://github.com/PaddlePaddle/Paddle into pure_fp16_2.0
wzzju
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