update from PaddlePaddle#3

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AshburnLee merged 230 commits intoAshburnLee:developfrom

PaddlePaddle:develop

Sep 30, 2020

Commits on Sep 17, 2020

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Commits on Sep 20, 2020

【paddle.fleet】Fix/role maker api fix (#27326)
seiriosPlus
authored

Commits on Sep 21, 2020

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Commits on Sep 26, 2020

Add conv2d bfloat16 support (#27325)
joanna.wozna.intel
authored
fix guard place set error (#27573)
chenwhql
authored
fix cpplint error for the autmic max/min
ZHUI
authored

Commits on Sep 27, 2020

Commits on Sep 28, 2020

Commits on Sep 29, 2020

Commits on Sep 30, 2020