Merge pull request !2369 from baihuawei/reduce

Merge pull request !2398 from h.farahat/slice_bug

Merge pull request !2404 from xulei/input_output

Merge pull request !2375 from h.farahat/python_tokenizer

Merge pull request !2420 from liyong126/mindrecord_epoch_shuffle

Merge pull request !2393 from lianliguang/fix-bug-of-merge-cast-to-op-and-gene-hccl-kernel-info

Merge pull request !2269 from dinghao/master

Merge pull request !2421 from yankai10/merge_master_new_fearture

Merge pull request !2160 from xianwz/master_graph_kernel

Merge pull request !2416 from caifubi/fix-new-control-stream-bug

Merge pull request !2419 from qianlong21st/temp

- It provides a unified style to express graph and kernel for user.
- It provides a unified IR to represent graph and kernel for developer.
- It breaks the boundary between graph and kernel.
- It provides more opportunities to do compile optimization.

Merge pull request !2415 from Kang/master

Merge pull request !2231 from yanghaitao/yht_get_num_samples

Merge pull request !1628 from 刘崇鸣/model_zoo_mass

Merge pull request !2397 from zhaoting/ResNet50_st

Merge pull request !2356 from zhaozhenlong/fix-issues-broadcastto-same-shape

Merge pull request !2380 from xiefangqi/xfq_fix_coco_issue_01

Merge pull request !2381 from liangzelang/dev

Merge pull request !2384 from YuJianfeng/split

Merge pull request !2402 from liuwenhao/master

Merge pull request !2396 from jjfeing/master

Merge pull request !2391 from BowenK/op_elim

Merge pull request !2378 from flywind/fix_yolov3_bug

Merge pull request !2394 from kisnwang/add-cpu-outputsync

Merge pull request !2056 from zhoufeng/enable-new-control-sink

make unsupported shape error info explicit

Merge pull request !2406 from jiangjinsheng/issue_fix4

Merge pull request !2157 from hangq/master