Add `make clean` in docker/build.sh

remove duplicated mobile index

Fix the error when sorted_key is none in profiler

* refine buffer channel

*  refine Receive and Send

* follow comments

* Adding more receivers less senders

* Added more receivers less senders

* Added more send

* Updated comment

* Fixed code style

* Fixing review comments

Buffered channel should notify both condition variables on close

Add depthwise conv op gpu

simplify shape inference code

Refine elementwise_op

Add v2 dist benchmark vgg

 Add multi-class non-maximum suppression operator.

Reclassify and change of V2 API documentation structure

add mine_hard_examples operator

add box coder op

Allow uers to specify the name of moving mean and variance in batch_norm interface.

add switch op design

Adding unit tests for checking that closing unbuffered channel closes all blocked senders and receivers (#8067)

* Adding unit tests for checking that closing unbuffered channel closes all blocked senders and receivers

* Fixing sleep time