split into datasets

review fix

fix merge issues

fixed minddata lite build issues

Merge pull request !3346 from lixiachen/repeat_rework

Merge pull request !3944 from xiefangqi/md_new_api_CelebA

Merge pull request !4072 from hewei/fixbug_tensor_equal

Merge pull request !4060 from fary86/fix_while_concat_specialize_error

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 !4005 from fangzehua/unsortedsegsum

Merge pull request !4004 from fangzehua/squaresumall

Merge pull request !3789 from riemann_penn/eager_mode_sparse

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 !4000 from zhangbuxue/improve_bool_for_tensor

Merge pull request !3966 from lichen/add_dropout_distributed_op

Merge pull request !3938 from liubuyu/master

Merge pull request !3807 from 徐永飞/master

Merge pull request !3916 from xychow/remove-loss-scale-range-check

Merge pull request !3940 from zhangbuxue/support_interface_all_and_any_of_tensor

Merge pull request !3915 from Simson/push-to-opensource

Merge pull request !3928 from yihuaijie/dev

Merge pull request !3127 from flywind/infer_2

Merge pull request !3648 from 张毅辉/zyh_profiler_test

Merge pull request !3715 from BowenK/new_pattern

Merge pull request !3756 from XunDeng/pp_poc_v3

Merge pull request !3370 from xychow/fix-context-dup