* Enable Gather with negative indices.

* Address PR feedback.

* Remove GOE from Gather unit tests.

* Hotfix for negative axes in unsqueeze op

* Review fix I

* Add missing input

* If builder does nothing, don't dive into the inputs

* Reverse test

* simplify, add test

* Add test

* Add cmake util to find os type

* Change CENTOS to REDHAT

* Set RPATH based on OS type

* Remove debug strings

* Provenance for builders (#3644)

* Provenance for builders

* Tests

* Tests

* Update src/ngraph/node.hpp
Co-Authored-By: Sayantan Sarkar <sayantan.sarkar@intel.com>

* style

* Finish migration

* Add ops constructed by ops

* Constructors.

Type prop.

Decompose LayerNorm.

Add serialize.

* Add dummy test case.

* Add dummy type prop test.

* Fix some build errors.

* Remove build errors.

* Update decompose for bprop.

* Change begin_norm_axis default value to 1.

* Style.

* Reorder class members.

* Add actual type prop tests.

* Add fprop test.

* Working on bprop test.

* Bprop tests.

* Allow flattened scale and bias.

* Add support for flattened scale and bias.

* Fix incorrect type_name.

* PlaidML: Decompose fused_op LayerNorm

* Update Backprop constructors.

* PlaidML: Add missing header file.

* Remove doc about removed param.

* Fix type prop tests.

* PlaidML: Disable unit test.

* Fix stats flattening axes bug.

* Validate ReverseSequence attributes according to the ONNX spec

* UT error message adjustment

* Do not throw for unknown domains in ONNX models

* UT that makes sure onnx_importer does not throw for unknown domains

* Check if nGraph throws for unknown ONNX domain and op

* WIP

* Fixes

* Increase bitwidth for arg idx attrib

* Minor fixes

* style-apply

* nGraph-ONNX CI improvement

- Added parallel CI on many SKUs,
- Jenkinsfile written in Declarative Pipeline which allows displaying sequential stages for parallel branches in Blue Ocean
- Moved proper CI code to ngraph-onnx repository
- Moved base_image_builder to ngraph-onnx repository

* Fix license header

* try catch for git info retrieval

* Add unsupported ops to iGPU backend

* Revert previous change

* [MLIR] Enable LIT testing in CMAKE

This PR enables LIT testing in nGraph for MLIR Compiler, introduced in
PR3523. We can now do `make check-mlir-lit` to run LIT tests.

* Address feedback

* Revisit PR after cmake clean-up

* [MLIR] Introduce ngraph-opt tool

To be used, among other things, for LIT testing.
`elementwise_binary_ops.mlir` shows a simple LIT test
using ngraph-opt.

Dummy affine_lowering/lit_test.mlir test that served as initial testing
of LIT tool configuration is now removed.

* Address feedback

* Bump MLIR version and minor fixes in nGraph

* advance commit ids

* fix commit id

Fix reshape error for onnx (on master)

Fixed NormalizeL2 decomposition for input shape length != 4

Initial support for float16 was done before the ngraph::float16 data
type was introduced in nGraph. This PR aligns ONNX frontend with the
latest float16 implementation.

* cleanup op includes in headers

* fix missing include

* [MLIR] Enable LIT testing in CMAKE

This PR enables LIT testing in nGraph for MLIR Compiler, introduced in
PR3523. We can now do `make check-mlir-lit` to run LIT tests.

* Address feedback

* Revisit PR after cmake clean-up

* Use mkl-dnn v1.0 or v0.x depending on compilation flag.

* Change cpu builder files.

* Modify cmake files.

Use mkldnn-v1.0 for DEX if NGRAPH_USE_MKLDNN_V1 is set to true, otherwise use mkldnn-v0.x.

CODEGEN only builds with mkldnn-v1.0.

* Implement mkldnn utility functions for mkldnn-v1.0.

User mode scratchpad management for mkldnn-v1.0.

* Query scratchpad size and allocate a buffer of max scratchpad size.

* Do not create mkldnn::memory when query scratchpad size of Reorder.

Modify mkldnn utility functions.

Fix convolution_forward_init and inner_product_forward_init.

Modify CPURuntimeContextCG.

* Add user mode scratchpad to CODEGEN.

* mkldnn-v1.0 splits LSTM states. Update Rnn/Lstm Op accordingly.

* Address PR feedback: use MKLDNN_MAJOR_VERSION.

* Modify cpu rnn fusion pass and related unit tests.

* Change Rnn/Lstm arg types to Output.

* Fix Lstm for CODEGEN.

* Set native layout for Slice when input format is blocked.

* Do not print scratchpad size.

* Change external_mkldnn_v1.cmake.

Fix a typo.

* Add mkldnn_v1.patch for mkldnn-v1.0.

* Address PR feedback.

* Define MKLDNN_ERROR_MESSAGE.

* Address PR feedback: change to NGRAPH_USE_LEGACY_MKLDNN.

* Fix a bug.

* Remove unused variable.

* Fix compiler warnings.

* Fix a bug for CODEGEN.

* Move variable only needed for mkldnn-v0.20 inside #if.

* Remove unused variables.

* No in place Reshape rotation for blocked data layout with mkldnn-v1.0.

* Modify mkldnn_v1.patch to force mkldnn to link to libiomp.

* Fix style.

* Change path for find_library and find_file.

* Do not insert ConvertLayout before/after Quantize/DeQuantize for blocked data layout.

* Write strides information to visualized graph.

* Move variables only needed for mkldnn-v0 under #if.

* Move more variables in rnn fusion.

* Fix ConvertLayout constant folding for mkldnn-v1.0.

* Add missing includes

* style

* Don't hold to shared pointers after sub-graph extraction pass is done

* style

* Add replace_by_friendly_name function

* Add replace_nodes function

* Nuke replace_by_friendly_name

* Modify replace_nodes to handle parameter replacement

* Move required reshape helpers to builders

* Remove warning from matmul_factory

* Rid off onnx dependency from matmul factory

* Move malmul_factory into builders

* Add implementation of fused MatMul

* Add MatMul to serializer

* Add type_prop tests

* Remove reference.

* Make more metods private

* Use protected instead of private

* Fix compilation issues

* Change construction of matmul_factory in matmul op

* Add MatMul operator into switch of is_supported_impl function

* Change transpose flags from int to bool

* Review Fix I

* Update MatMul op

* Use OutputVector instead of NodeVector in MatmulFactories

* Fix usage of OutputVector

* Convert more shared_ptrs to Outputs

* Fix comments after merge

* Fix comments after merge II

* Fix comments after merge III