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Change the "scatter" struct and op to a base/child set of three: scatter_none, scatter_add, scatter_mul to mirror Onnx' ScatterElements op. and its three reduction options. (Onnx Scatter op is deprecated and is equivalent to scatter_none.)

Provides both a reference op. and update to Onnx parsing. Tests updated and new test case added.

Implements the IsNaN operator, ref, gpu, and onnx parser.

This PR is the ref implementation of the nonmaxsuppression operator. It always returns the max possible output shape, which is the problem tracked in issue #948.

* add support for axes inputs for sequeeze/unsqueeze/reduce_sum

* clang format

* fix build problems

* backup code changes

* clang format

* fix a bug in parsing quantizelinear operator

* clang format

* fix a cppcheck error

* disable different versions of unit tests for different onnx version

* clang format

* upgrade onnx to 1.8

* update onnx to 1.8.1

* disable two more real models

* clang format

* fix review comments

* fix the function of assign axes in parsing the squeeze operator

* add unit tests and fix a bug

* clang format

* fix review comments

* clang format

* fix a build error

* backup code changes

* clang format

* add more unit tests and add parsing opset version

* clang format

* fix cppcheck error

* adding installing the onnx package

* resolve no protobuf compiler

* fix cppcheck error

* add unit tests for more code coverage

* clang format

* try a comment in jenkins build

* include the install onnnx line

* code backup

* reorder the dependenciesd installed

* refine dockerfile

* fix review comments

* clang format
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>

* changes for not operator

* changed name of the op from unary_not to not

* Added tests for op and onnx parsing

* reordering not_test in onnx_test.cpp

* not operator -- gpu implementation

* added bool test for not operator

* Added test and missing links for not operator on GPU

* typo fix

* adding .onnx test files for not operator

* formatting
Co-authored-by: Shucai Xiao <shucai@gmail.com>
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>

* Load op when serializing

* Formatting

* Add missing clip field

* Use make_op almost everywhere

* Formatting

* More make ops for rnns

* Get rid of spaces

* Formatting

* Remove operators headers

* Formatting

* Remove unused op headers

* Increase line threshold

* Refactor onnx_parser class

* Formatting

* Add op_parser

* Formatting

* Remove old onnx drivers

* Use file GLOB

* Parse arg ops

* Formatting

* Add pooling

* Formatting

* Add parse_natchnorm

* Add more operators

* Formatting

* Add more operators

* Formatting

* Add more operators

* Formatting

* Add more operators

* Add rnn operators

* Formatting

* Fix tidy issues

* Formatting

* Add back missing param

* Formatting

* Fix shadow variable

* Fix shadow in declaration

* Make global constant

* Formatting

* Add generic op

* Formatting

* Add binary op

* Formatting

* Add variadiac op

* Formatting

* Remove unused fields and functions

* Set default values

* Formatting

* Remove unused member variable

* Add add literal overload

* Use info.add_literal

* Formatting

* Call add_instruction through info class

* Fix tidy issues

* Formatting
Co-authored-by: mvermeulen <5479696+mvermeulen@users.noreply.github.com>