Merge pull request !4764 from zyli2020/gpu_bn_op_perf_optimize

fix pylint

changed doc and code for SmoothL1Loss to be same a dchip. fixed grad kernel

fix ci

Merge pull request !4704 from chengang/fix_ps_multi_worker

Merge pull request !4436 from peixu_ren/custom_gpu

Merge pull request !4699 from danishnxt/GPU_two

fix ci

fix ci

lint py fix 2

nms_py_file test value fix

lint fix

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

Merge pull request !4581 from yao_yf/modelzoo_wide_and_deep_mutitable

Merge pull request !4585 from baihuawei/broadcast

Merge pull request !4579 from zyli2020/fix_sigmoid_cross_entropy_bug

Merge pull request !4566 from huanghui/scatter-nd-update-cpu-kernel

Merge pull request !4423 from lianliguang/add-reshape-type-to-tensor

Merge pull request !4479 from Peilin/gpu-reg-macro-fix

fixed some bugs

fixed cpplint

fix cpplint

Merge pull request !4251 from Peilin/efficientnet

Merge pull request !4246 from Peilin/faster-rcnn-type-support

Merge pull request !4024 from JonathanY/roihalf

Merge pull request !4368 from 34bunny/GPU-RandomChoiceWithMask-fix

Merge pull request !4418 from huanghui/unique-with-pad-cpu-kernel

Merge pull request !4343 from ZhangQinghua/master

fix pylint

addressed code review comment

Merge pull request !3918 from lilei/random_normal_0724

addressed code review comments

fix cpplint and pylint

trying to fix python ut

fix smoke test

Merge pull request !4300 from jjfeing/master

Merge pull request !3800 from baihuawei/multinomial-c

Merge pull request !4298 from chenweifeng/maximumgrad