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* Remove extra copy in gemm

* combine rocblas gemm call

* clang format

* fix a bug in calling rocblas function

* clang format'

* backup of temporary changes

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* unify the gemm call to avoid multiple gpu implemantation

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* remove unnecessary code

* backup temp changes

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* fix cppcheck error

* code backup

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* remove unnecessary synchronization function

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* fix bugs

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* more optimization related to gemm

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* code cleanup

* implementation that can achieves better performance

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* temp changes to try performance

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* revert to previous commits

* fixed review comments

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* fix review comments

change the shape attribute in the broadcast operator to a vector of lens since the type is not used at all.

fix comments about enum rnn_direction, rnn_last_output, and added more tests to achieve better code coverage