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This reverts commit f6b6b510.

* remove unused functions

* shut up annoying warnings via cast

* prabhat's comments

* Fixed clang format error
Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

This reverts commit 3bfdb427.

* multithreading allowed in stream codec context

* numThreads is passed as a decoder parameter. At this stage code should be unchanged

* enabling multithreading in videoReader API

* moving defaults to header files

* replace long with int64_t because torchscript

* docstring for Num threads

* Enable codec-related heuristics as defaults

* Update torchvision/csrc/io/decoder/stream.cpp
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Fixing build errors

* minor docs

* Linting

* updating defaults for the C++ function calls to be single threaded

* adding special case for single threaded stuff
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

Summary:
Noticed this copy-paste error while reading D26026259 (https://github.com/pytorch/vision/commit/f16322b596c7dc9e9d67d3b40907694f29e16357) for inspiration to solve a similar problem

Created from Diffusion's 'Open in Editor' feature.

Reviewed By: datumbox

Differential Revision: D26373056

fbshipit-source-id: d67f46243a280e8a59d12bad9dd730c1a3d512c9

Summary:
Upgrading service to platform009 enforces tls1.3 authentication.
Specify tls cert file to decoder through config.
Context: https://fb.workplace.com/groups/2020511478062223

Differential Revision: D26026259

fbshipit-source-id: e89f88ff7e41ec6b6a62e85d9015d78f6377aa65

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