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The inaccuracy was caused by ONNX round requires nearest integer rounding for halway (0.5) cases.
std::round rounds away from zero, thus giving wrong results with halfway cases.
Replaced std::round with std::nearbyint which uses the correct rounding by default.

Adds workarounds to avoid passing capture ops and scalar literals from quantization as arguments to ck_gemm.

* add quant_dot fusion, clip literal opt

* Allow quantizing for both int8 and fp16

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

* Add operators, refactor parsers, add rewrite passes, add tests

* Formatting

* Fix cppcheck

* Review comments

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* Combine rewrite passes

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* Add ref implementations

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* Review comments

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* Tidy warnings

* Apply review comments

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* Fix CI error

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* Increase code coverage

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* Move broadcasting of scales and zero points to onnx parser

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* Allow for x and zero_point to have different types in quantizelinear; fix zero_point default type

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* Increase code coverage

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* Switch certain variables to int64_t

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* Fix overflow in implicit constant conversion

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* Increase code coverage

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* Remove operators.hpp from includes in tf_test.cpp

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* Add conversion for int32 input to quantizelinear and add test case; remove operators.hpp from onnx_test.cpp includes

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* Switch dequantizelinear math from int32 to float

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* Remove changes to operators.hpp

* Simplify apply_quantizelinear

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* Add verify test for int32 data

* Add rewrite_quantization back to CMakeLists