Merge pull request !4268 from liubuyu/master

Merge pull request !4197 from YuJianfeng/adam_assign

Merge pull request !4220 from liyong126/minddataset_pk_num_samples

Merge pull request !4247 from 章一智/channel_swap_op

Merge pull request !3850 from islam_amin/randomaffine_op

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

split into datasets

review fix

fix merge issues

fixed minddata lite build issues

Merge pull request !3944 from xiefangqi/md_new_api_CelebA

1. Check if data_ is null before compare it;
2. Always allocate an array for data_ even if size is zero.

Merge pull request !4019 from yao_yf/add_layout_in_stra_ckpt

Merge pull request !3977 from nhussain/multi_dim_concat_2

Merge pull request !3860 from xiefangqi/md_new_api_cocodataset

Merge pull request !3983 from huanghui/reduce-min-fission-pass

Merge pull request !3938 from liubuyu/master

Merge pull request !3807 from 徐永飞/master

Merge pull request !3928 from yihuaijie/dev

Merge pull request !3127 from flywind/infer_2

Merge pull request !3821 from ZhangQinghua/master1

Merge pull request !3103 from yihuaijie/dev

Merge pull request !3820 from zhangbuxue/support_dtype_and_shape_as_attr_in_graph_mode