GitLab

* Add quantized version of nms

* Added tests

* Compute areas only once

* remove calls to dequantize_val

* fix return type for empty tensor

* flake8

* remove use of scale as it gets cancelled out

* simpler int convertion in tests

* explicitly set ovr to double

* add tests for more values of scale and zero_point

* comment about underflow

* remove unnecessary accessor

* properly convert to float for division

* Add comments about underflow

* explicitely cast coordinates to float to allow vectorization

* clang

* clang  again

* hopefully OK now

* Replace type T with accumulator.

* Upcast tensors of box ops to avoid overflow in multiplications.

Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Adding TORCH_SELECTIVE_* macros on op registration.

* Adding torchvision namespace.

* Removing VISION_API from backward() methods and adding a ops.h

* Fixing clang format.

Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

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