* Backend test: MaxPoolBackprop test strided and padded

* PR1428. Test excluded from CPU backend

* Optionally get rid of codegen from the CPU backend

* Rename option variable

* Merge fixes

* Merge

* Remove extra changes

* remove dex only exclusions (#1429)

* Unconditionally pick  m_direct_execution if NGRAPH_DEX_ONLY

* Style fix

* IntelGPU backend: Code refactoring and optimization

* Update gen_func_def()

* dex sigmoid multiply

* sigmoid multiply

* refactor compute logic into standalone kernels

* address jayaram's feedback

* onnx: pull Protobuf 3.5.x from GitHub
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix Travis build configuration issue
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: additional fixes for Travis
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: update documentation - build requirements for MacOS
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: update documentation - build requirements for Ubuntu
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* Merge

* Remove extra changes

* IntelGPU backend: Minimum, Not, OneHot operations

* Code format update

* Refactor OneHot op

* PR1414. exclude one test

* Fix errors

* IntelGPU backend: MaxPoolBackprop operation

* PR1427: Initialization loop added

* Define and track tensor roles through graph optimizations

* style fix

* Address PR feedback

* Fold affine transformations on 4d convolution

* Handle more cases for affine parameters

* Style fix

* Temporary broadcast optimizations till halide support is merged

* Use computed broadcast axes

* Move shape squeeze

* Review feedback: Add comments

* Patch broadcast axes after the last refactor

* Squeeze input shape

* onnx: add 'constant' operator
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: getting attribute value by name
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix code style
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix clang compilation warnings
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: exception
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: add 'split' operator
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: add public interface
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: add initial unit test for importer
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: initial implementetion of operator' set
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* [WIP] Unit test for split operation.

* Fix Split Op bounds calculation + UT

* clang format

* Split Op with variable parts unit test.

* Remove unused headers

* General purpose exceptions.

* Change not_supported_error message template.

* Add new general purpose errors.

* ONNX BatchNormalization operation.

* Clang-format

* Update CMake

* Add fixed test data.

* Add missing ngraph install prefix for cmake in travis Dockerfile.

* Remove -Wno-zero-as-null-pointer-constant

* Code review

* Apply clang-format-3.9

* Add missing onnx_import interface files to CMakeList

* Clean code.

* Fix test.

* Apply clang-format-3.9

* Copyright notice format

* Remove inputs in separate files

* use all_close to compare floating point values

* missed changing one CPU to INTERPRETER for unit test

* Add OneHot op to direct execution.

* Remove exceptions from kernel.

* Use Eigen::Tensor.

* Removed unused code.

* format-fix

* Added MKLDNN concat in DEX

* Fix allocation size in batchnorm kernel

* added missing brackets

* Support in-place input & output propagation

* Remove validation checks from performance critical code paths and skip layout propagation to inputs

* Add templated call method to backend for cases where users need input validation

* Added missing return

* fix python api compile error due to ngraph api change.

* disable parameter validation in python api

* make validating call a separate call rather than templated

* don't propagate outputs inplace to constants

* apply formatting

* refactor for style-check

* fix typo

* onnx: add 'constant' operator
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: getting attribute value by name
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix code style
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix clang compilation warnings
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: exception
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: add 'split' operator
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: add public interface
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: add initial unit test for importer
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: initial implementetion of operator' set
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* [WIP] Unit test for split operation.

* Fix Split Op bounds calculation + UT

* clang format

* Split Op with variable parts unit test.

* Remove unused headers

* Add missing ngraph install prefix for cmake in travis Dockerfile.

* Remove -Wno-zero-as-null-pointer-constant

* Code review

* Apply clang-format-3.9

* Add missing onnx_import interface files to CMakeList

* Copyright notice format

* Dex non-mkldnn version of clipped relu

* Change to static_cast

* separate backend updates for shared and static libs into separate PR

* add search for shared libs to statically linked libs

* update per review comments

* update per review comments

* Add cudnn host data param case for CUDNN_DATA_INT8x32

* Default case.

* break

* def guards

* removed def guard for ci test.

* put def guards back

* Remove default to make clang happy.

* Remove clang default switch warning on cudnnDataType_t enum.

* Formatting.

* Added Wswitch-enum supression.

* Back to switch, remove pragma clang suppression.

* disable one more switch compiler check

* Remove default break after throw.