Merge pull request !4206 from hewei/fix_tensor_to_string

Merge pull request !4227 from panbingao/pylintfix

Merge pull request !4249 from XunDeng/pp_poc_v3

Merge pull request !4021 from XunDeng/scalar_affine_softplus

Merge pull request !4197 from YuJianfeng/adam_assign

Merge pull request !4220 from liyong126/minddataset_pk_num_samples

Merge pull request !4185 from xychow/move-core-ops

Merge pull request !4260 from yeyunpeng2020/master

Merge pull request !4200 from 徐安越/master

Merge pull request !4247 from 章一智/channel_swap_op

Merge pull request !4223 from zhanyuan/micro_dev

Merge pull request !4158 from zhangbuxue/fix_bugs

Merge pull request !4048 from linqingke/new_ops

Merge pull request !4214 from 陶云浩/modify

Merge pull request !3850 from islam_amin/randomaffine_op

Merge pull request !4224 from lvwenyuan/master

Merge pull request !4239 from chenzupeng/master-lite

Merge pull request !4130 from hanhuifeng/gpu_dropout

Merge pull request !4232 from Etone.Chan/August

Merge pull request !4250 from anthonyaje/fix_cpp_api_iterator

Merge pull request !3917 from luoyang/c-api

Merge pull request !3979 from MahdiRahmaniHanzaki/mixup

Merge pull request !4229 from hangq/master

Merge pull request !4225 from JoyLvliang/fix-bug-avoid-multi-attr-value-be-eliminated-in-pynative-mode

Merge pull request !4074 from baihuawei/0806

Merge pull request !4228 from yeyunpeng2020/master_deconv

Merge pull request !4144 from zhengjun10/master

Merge pull request !3952 from Etone.Chan/August