* fix the bug of div operation result using scale method do not exactly equal the result of elementwise_div method

* remove __div__ , __rdiv__ methods which do not define in python3

* modify the note

* add test case

* add test case

* update mp

* fix path error on windows when precision switch is turn on

* fix error

* Update get_pr_ut.py

fix format error

* Update get_pr_ut.py

* add trt convert op: reshape

* reshape

* fix

* input: Shape,ShapeTensor

* Add some comments

* fix spawn default nprocs get error

* polish error message

* fix syncbn

* Align download_filename with cached_filename

* download_verify

* checksum

* replace and remove complex64/128 types in custom OP and other files

* fix custom_tensor_test fail bug

* fix custom_conj_test fail bug

* fix dispatch_test_op build fail bug

* enhance error message for conv

* fix ci coverage

* improve group norm cpu precision and performance

* add unit test to group norm

* support params groups, test=develop

* simplify updating opt attr

* update according to review