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* add bool type

* code backup

* code backup

* clang format

* fix build warnings

* clang format

* add the equal operator

* add the equal operator

* clang format

* remove unnecessary code

* refine unit tests

* clang format

* fix review comments and a bug

* clang format

* additional changes

* clang format

* fix cppcheck error

* add bool type in c api

* fix cppcheck error

* fix review comments

* fix cppcheck error

* fix a build error related to gcc

* fix cppcheck error

* fix cppcheck error

* added the equal operator to register list

* add parsing boolean type

* clang format

* fix bool type issue for python output

* clang format

* add support for automatic multibroadcast of the equal operator

* additional unit tests for more code coverage

* clang format

* missing an onnx file

* code cleanup

* clang format

* fix issue of int64 data type in python api

* clang format

* include more onnx backend unit tests

* add more unit tests to cover code changes

* clang format

* disable python tests for python2.7

* code backup for python half type support

* clang format

* code change to support half data type in python

* add a unit test for python half type

* clang format

* add more unit tests for more code coverage

* clang format

* add more unit tests for more code coverage

* clang format

* refine unit tests to have more code coverage

* clang format

* update python unit test

* revert to a previous version of test_gpu.py