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* Conditionally include Python in the C++ builds.

Added an option `USE_PYTHON` that allows users to decide to link to Python3 or not.

* Also conditionally include this defintion.

* Define `USE_PYTHON` for the Windows builds.

* Remove Python3 reference in CMake test as it's no longer required.

* Accidentally removed the closing > from the decl.

* Also add `USE_PYTHON` when building the separate image library on Windows.

* Also conditionally include this depening on USE_PYTHON.

* Go back to require Python for this example.

* Find Python in the hello world example.

* Add a paragraph documenting the `USE_PYTHON` option.
Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

* add pre-commit hooks

* ignore yamls in packaging/*

* add pre-commit to contributing guide lines

* Update CONTRIBUTING.md
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

* remove some hooks

* fix docstrings

* fix end of files
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

* Add deprecation warnings on vision::models

* Change the C++ example.

* Chage readme.

* Update deprecation warning.

Summary:
* Reduce unnecessary header inclusions in models and io.

* Move autocast to separate folder and hide autograd implementation in an anonymous namespace.

* Moving files in subfolders.

Reviewed By: fmassa

Differential Revision: D25461523

fbshipit-source-id: 756eeb6848aacaa474de4825ed4c1045d17e2cea

* Run C++ torchvision example as part of cmake tests

* Enable C++14 support

* Minor error correction

* Add GPU forward on example

* Use arrow operator

* Add hello world example for C++ torchvision

* README updates and mention the hello_world example