Merge pull request !2658 from baihuawei/reduce

Merge pull request !2675 from hexia/deal-logical-and

Merge pull request !2490 from gukecai/new-stream-for-commit

Merge pull request !2558 from jjfeing/master

Merge pull request !2552 from chenjianping/host_reduce

Merge pull request !2245 from hewei/decouple_tensor

Merge pull request !2140 from ShidaHe/debugger_dev

Merge pull request !2434 from jjfeing/master

Merge pull request !2460 from kisnwang/optimize-cpu-reduce-gradient

- 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 !2396 from jjfeing/master

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

Signed-off-by: zhoufeng <zhoufeng54@huawei.com>

Merge pull request !2313 from caifubi/save-profiling-point

Merge pull request !2176 from chenfei_mindspore/code-review-of-session

Merge pull request !2361 from kisnwang/fix-codex-reviewbot

Merge pull request !1990 from caifubi/fix-profiling-stream-id

Merge pull request !2222 from wangcong/master

Merge pull request !2247 from yanghaoran/master

Merge pull request !2164 from lianliguang/master

Merge pull request !2215 from caifubi/support-hccl-profiling

Merge pull request !2125 from lianliguang/master

Merge pull request !2051 from chenjianping/host_reduce