* optimize replace slice

* fix bugs

* fix bug

* optimize pad dynamic

* fix bug

* fix bug

* fix bug

* remove *

* add gpu_assignment to pass

* refactor cuda replace slice.

* fix bug

* refactor replace slice

* working version

* clang format

* us layout instead of assignment

* us layout instead of assignment in cmakelist

* update gpu_layout

* fix bugs

* resolve conflict

* GPUShape to NVShape

* using kernel args

* using kernel args

* fix bugs

* fix bugs

* fix bug, remove mkldnn.h from gpu_layout.cpp

* fix bug for pad_below

* remove cast to rep_slice

* fix bugs

* clang format

* change add_in_place_oi_pair({0, 0, false} to add_in_place_oi_pair({0, 0, true};

* [ONNX] Add Relu op

* Refactoring

* Refactoring - move op::Constant implementation to .cpp file

* cmake file list order

* Code review

* [ONNX] Add Relu op

* IntelGPU backend: BatchNormBackprop operation

* PR1443. Requested refactoring done

* Collapse dims when possible to facilitate faster kernels

* Minor debug change

* Define and track tensor roles through graph optimizations

* 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

* [Py] Wrapper for LRN

* Add missing header

* Add default param values, docs and some unit tests

* Fixes

* clang-format

* 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

* Clarify ng backends as devices

* revise some intros and add menu link