* Add PlaidML backend

* CR comments

Used m_ prefix for members; removed trailing underscores
Updated license headers
Moved associated header inclusions to project blocks
Wrapped comments to 100 chars
Added missing newlines between functions
Removed nested namespaces in operation implementations

* Add earhart to CODEOWNERS

* Rebase updates

* style

* Move to TBB2019 and bug fix to capture functor

* Change to use TBB release tag

* remove lightweight from codegen

* Enable TBB flow graph tracing

* skeleton backend

* Code owner from if conditioning

* add simple placement for interpreter and register pass in hybrid

* placement policy applied

* clone the function if needed

* split the function

* Compile subfunctions in corresponding backends

* hybrid backed works as is for abc test

* cleanup

* add placement policy for CPU

* cleanup a little

* add simple op cost method to backend

* enable CPU pass via flag

* address clang-format PR issue

* reslove build

* clean-up

* update manifest

* disable HYBRID as default build

* style

* addressing offline discussion

* more offline discussion

* move backend specific test files to test/backend directory

* remove unit_test_control

* move tests back to test root

* fix comment

* wip

* fix manifest

* Added cmake flags to specify D_GLIBCXX_USE_CXX11_ABI and disable building of doc

* Renamed the NGRAPH_DOC_BUILD_ENABLE flag based on PR feedback

* cmake: use GNUInstallDirs to autodetect installation directories (Linux)
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* define LINUX variable to detect Linux
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnxifi: add 'onnx' as external project
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnxifi: public interface function stubs
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnxifi: fix the typo in function name
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: fix compilation Ubuntu 16.04
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnxifi: update to dummy backend
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnxifi: style cleanup
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* add detection of Linux distribution
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: disable ONNX unit-tests if CentOS detected (temporar solution)
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

* onnx: correct DISTRIB_ID name for CentOS
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

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

* 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

* 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>

* compiles but does not link

* remove custom install path

* fix travis build

* Add NGRAPH_INSTALL_PREFIX as an alias for CMAKE_INSTALL_PREFIX to make our unit tests pass.

* change install path setting

* onnx: add importer cmakes
* onnx: use file(DOWNLOAD ...) command to download onnx.proto
* onnx: add Protobuf minimal required version

* cmake runs for interpreter

* more updates towards building on windows

* First IntelGPU backend based on clDNN with empty functions

* Backend/API:Conflicts resolved and comments addressed

* updated to work with llvm 8.1 that tensorflow is built with

* sane extensions on the mac

* not doing rpath on apple

* apply style

* fix mkldnn rpath

* fix compile warning

* close backends when exiting

* set backend output directory of backends to the ngraph output directory

* Aprocter/patch patch (#1119)

* Move more rpath stuff inside if(NOT APPLE)

* fix repatch problem with mkldnn library

* add updated patch command for older versions of cmake

* Update cmake files to more modern approach

* disable building libraries that are not required

* handle more build cases

* add versions to backend libs. add start of package target.

* add create_backend to backends

* temporary workaround to tbb not linking correctly with gcc

* install codegen lib

* force tbb to link to the cpu backend so that it is available for codegen

* fix clang build error

* fix warning for codegen build

* update cuda header paths

* change error message for opening backend shared library

* set lib path

* Add mechanism for disabling specific backend unit tests from a manifest file.
Populate the test manifest files for CPU, GPU and INTERPRETER.

* update docs for new manifest controlled transformer unit tests

* create ngraph_test_util

* installs libngraph_test_util

* migrate files

* apply version number to libngraph.so

* fix cmake running with empty build directory

* Remove single-line comments ending with backslash

These comments cause warnings on gcc.

* Add -DNGRAPH_DEBUG_ENABLE cmake option

* Forgot to update log.hpp

* Better comment in CMakeLists

cleanup some enable flags in cmake. add flags to optionally disable building unit tests and tool (#917)

executables not shared libraries. This change will remove the following
warning.
ld: warning: -pie being ignored. It is only used when linking a main executable

* CMake: Allow build target arch to be overridden

* Add DNGRAPH_TARGET_ARCH option to install docs