[API 2.0] add functional pool1d API#26108

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LDOUBLEV wants to merge 14 commits intoPaddlePaddle:developfrom

LDOUBLEV:develop

Commits on Aug 10, 2020

add functional pool1d API,test=develop
LDOUBLEV
committed

Commits on Aug 16, 2020

fix unittest case, test=develop
LDOUBLEV
committed

Commits on Aug 17, 2020

Commits on Aug 18, 2020