Merge pull request !311 from VectorSL/select

Merge pull request !274 from ZPaC/gpu-backend-supports-multiple-streams

2.GPU commnication stream and compute stream overlap.

Merge pull request !260 from lianliguang/refactor-padding-strategy

Merge pull request !226 from wangnan39/expend_conv_stride_to_2d

Merge pull request !270 from SanjayChan/mac_os

Merge pull request !200 from chengang/quant

Merge pull request !248 from zjun/fix_getnext_bug

Merge pull request !233 from jjfeing/master

Merge pull request !168 from Alexey_Shevlyakov/remove_mindspore_make_unique

Merge pull request !56 from jojobugfree/dev-rm-cce

Previously function op_select_format and check_supported raise an exception directly on the tbe_process python side, but we don't deal with the exception, and raise an exeception on c++ side to frontend ME, that will cause some conflict when recycle resource on ME and tbe_process python interpreter.
This changes adding try...catch in function op_select_format and check_supported on the python side, and return the Exception string to c++ side, so that we can raise an exception to frontend ME and ME will deal with resouce clearning and exit.

Signed-off-by: leonwanghui <leon.wanghui@huawei.com>