Created by: LDOUBLEV

PR types

New features

PR changes

APIs

Describe

add API include:

• paddle.nn.functional.avg_pool2d

• paddle.nn.functional.max_pool2d

• paddle.nn.functional.avg_pool3d

• paddle.nn.functional.max_pool3d

• paddle.nn.layers.AvgPool2d

• paddle.nn.layers.MaxPool2d

• paddle.nn.layers.AvgPool3d

• paddle.nn.layers.MaxPool3d

• paddle.nn.functional.avg_pool1d

• paddle.nn.functional.max_pool1d

• paddle.nn.functional.adaptive_avg_pool1d

• paddle.nn.functional.adaptive_max_pool1d

• paddle.nn.AvgPool1d

• paddle.nn.MaxPool1d

• paddle.nn.AdaptiveAvgPool1d

• paddle.nn.AdaptiveMaxPool1d

中文文档PR： https://github.com/PaddlePaddle/FluidDoc/pull/2434/files