Merge pull request !3814 from liucunwei/enhance_map_file_for_imagenet

Merge pull request !3808 from 张学同/to_merge

Merge pull request !3836 from zhanyuan/master

Merge pull request !3776 from lixian/master

Merge pull request !3815 from xutianchun/quant_0731

2. fix anf_exporter bug: pool, concat op may not set into metagraph
3. fix weight trans pass will return error when post quantization
4. make anf_exporter reentrant: do not set PrimitiveT * to nullptr

Merge pull request !3827 from hangq/master

Merge pull request !3610 from TinaMengtingZhang/cpp-api-concat

Merge pull request !3829 from cathwong/ckw_c_api_transform_hdr_alpha

Merge pull request !3622 from EricZ/distributed_sampler_fix

Merge pull request !3760 from 34bunny/GPU-ResizeNearestNeighbor-fix

Merge pull request !3619 from danishnxt/GPU_One

Added Distributed sampler option

Fix style

!3693 Change the column order and add drop_reminder option to make the generated dataset compatible with BertCLS
Merge pull request !3693 from dessyang/master

Merge pull request !3549 from anthonyaje/device_augment_mapop_refactor1

Merge pull request !3553 from tony_liu2/staging

Merge pull request !3801 from liubuyu/master

Merge pull request !3780 from baihuawei/losscuda

Merge pull request !3739 from laiyongqiang/eliminate_memcpy_bug

Merge pull request !3804 from hexia/fix_pb2

Merge pull request !3239 from YuJianfeng/allgther

Merge pull request !3719 from RobinGrosman/master

Merge pull request !3728 from lijiaqi/add_calculation

Merge pull request !3119 from dengyutao/remove_blockreader

Merge pull request !3791 from ms_yan/vgg_8p_D

Merge pull request !3772 from zhaozhenlong/lite/issue/pad_assign_param

Merge pull request !3746 from baihuawei/loss

Merge pull request !3784 from wangzhe/master

Merge pull request !3779 from liubuyu/master