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partially solves #1656
This PR only handles compilation part of multitarget.

Fixes #1595

Updated each source file in the repo with the existing license.

Documentation update for valid targets

* Add all_targets cmake target

* Rename target

* Add ref target

* Rename tests

* Refactor compiler target

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* Verify for every target

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* Add verify test suite

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* Add initial test programs

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* Add rnn tests

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* Validate gpu

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* Remove old gpu tests

* Fix gpu tests

* Fix ref error

* Fix tidy issues

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* Tidy fixes

* Fix header in python api

* Rename to ref

* Use ref in verify_onnx

* Fix tidy issue

* Build with verbose on

* Fix typo

* Remove verbose

* rename some cpu prefix to ref
Co-authored-by: Shucai Xiao <Shucai.Xiao@amd.com>

* Add save/load functions

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* Add loading and saving to the driver

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* Add return

* Serialize the context with the program

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* Add python API

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* Add c/c++ apis

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* Add tests

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* Fix tidy error

* Fix python doc

* Restore python code

* Add function name to errors

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* Use lvalue for writing

* Serialize context

* Fix convolution and pooling operator for miopen

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* Add const ref

* Set target name to gpu

* Add target tests

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* Move register target to cpp file

* Fix target test

* Use make_target in driver

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* Use make_target for the API

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* Add cpu include

* Increase timeout

* Add more tests

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Co-authored-by: Shucai Xiao <shucai.xiao@amd.com>
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>