* workaround to avoid apt-get update error for GPU docker image build on Ubuntu 16.04: The method driver /usr/lib/apt/methods/https could not be found.

* removed extraneous proxy variables from the contrib/docker/Dockerfile for GPU on Ubuntu 16.04

* product simplifier

* char -> signed char

* Make temp memory pools static to avoid memory allocation overheads

* Initial implementation for graph control to enable caching and computation reuse

* Added sphinx documentation

* Turned off memory buffer reuse in CPU transformer to support computation reuse. Added unit test

* Change memoizable to cacheable

* Change memoizable to cacheable

* Rename variables

* First version of nGraph Python API documentation pages.

* Remove use of (`) apostrophes since they generate Sphinx warnings.

* Fix submodule rendering in Sphinx PythonAPI docs

* Add updated index and conf py files

* Updated version of Python API doc.

* Better description for the autosummary

* FIX: Disable autogeneration of summary files in documentation.

* MaxPoolWithIndices CPU Fusion

* fix test to pass checks in cpu_fusion

* pass test

* clean up

* add a new pass, add layouts

* remove the opt from cpu_fusion

* refactor cpu_layout logic for maxpool, clean up comments

* add comment w.r.t. indices tensor

* rename to cpu_workspace_insertion

* add CPUWorkspaceInsertion pass for TF

* sequence reverse

* fix test

* more tests for reverse_sequence

* remove debug prints, change perms

* fix formatting; remove dead code

* make seq_lengths a parameter

* autodiff + tests

* cse init

* init tests

* clean up; more tests

* remove visualizations

* add code to gpu reverse

* add reverse emitter and kernel builder

* working versrion

* remove in tensor.hpp and cpp

* remove in constructors

* more clean up at tv_wrapper and set_is_output()

* fix liveness

* fix liveness.cpp

* finally fixed liveness

* fix PrimaryTensorView constructor in node.cpp

* fix PrimaryTensorView constructor in cpu_tensor_view

* clang-format

* update tensor print

* clean comments

* rename

* Adding support for mkldnn convolution+bias+relu op to use in batch norm folding

* Style fix

* Style fix

* rename getters to adhere to ngraph coding guidelines

* fix renaminb

* fix build errors

* if a requested backend is not registered then try dlopen to force it to register

* call 'extern C create_backend()' in the opened shared object to register the backend

* use a single name to test for backend

* migrate files

* apply version number to libngraph.so

* fix cmake running with empty build directory

* remove clone --depth option

* 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

* Doc through relu, use mathtt instead of texttt in equations.

* Review comments.

* interpreter implementation and tests

* style

* correct

* tolerance

* skip

* type

* cast

* double

* types

* format

* add bn to the inference engine backend

Also the ONNX how to import file was tested and it was discovered
that the wheel was actually output to a different directory than
the one specified.

add templated get_data_ptr() methods to HostTensorView and Constant to make using them a little cleaner. (#924)

* add select op, pass data type for each operand

* fix bugs and apply clang format

* fix index bug

* add enable gpu convolution tests flag in py

* working version

* revert convolution_test.in.app

* use a skip list to skip backend for test

* add comment to remind implement of neeeded ops

Temporarily remove Python API docs. We're working on a better system of generating them.

- Disable autogeneration of summary files.

* Some more op documentation

* Review comments

* wip

* simplified interpreter backend

* pick broadcast if exists

* remove logic for sum

* get at broadcast using the label-on-skip approach

* tests for broadcast fix

*  add comments