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* python api support scalar argument

* clang format

* change parse operator function signature

* clang format

* add parsing the split operator

* clang format

* add parsing split operator

* make squeeze/unsqueeze inputs to standard shape

* add unit tests for the split operator

* clang format

* fix cppcheck error

* clang format

* update tests for multiple program outputs

* clang format

* update the function parse_graph

* clang format

* fixed an unit test

* revert code back

* remove blank line

* refine an error message

* add unit tests for code change

* clang format

* refine an error message
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>