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* Refactor setup.py to build only wanted extensions.

* Improve visual feedback for libpng support in setup.py.

* Improve printing of extensions finding in setup.py.

* Fix linter errors.

* Apply suggestions from code review
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Add flag to ignore ffmpeg in python build.

* Update setup.py to avoid potential collisions with other projects that are using FFMPEG
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

Co-authored-by: Bruno Korbar <bkorbar@quansight.com>
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

* run mypy on Python 3.9

* appease mypy

* Revert "run mypy on Python 3.9"

This reverts commit b935c8310ca755851f523af5aeb3a6f120b95abf.

* Allow gcc to be overwritten with an environment variable

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

* Return RGB frames as output of GPU decoder

* Move clamp to the conversion function

* Cleaned up a bit

* Remove utility functions from test

* Use data member width directly

* Fix linter error

* 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>

* [WIP] Add video GPU decoder

* Expose use_dev_frame to python class and handle it internally

* Fixed invalid argument CUDA error

* Fixed empty and missing frames

* Free remaining frames in the queue

* Added nv12 to yuv420 conversion support for host frames

* Added unit test and cleaned up code

* Use CUDA_HOME inside if

* Undo commented out code

* Add Readme

* Remove output_format and use_device_frame optional arguments from the VideoReader API

* Cleaned up init()

* Fix warnings

* Fix python linter errors

* Fix linter issues in setup.py

* clang-format

* Make reformat private

* Member function naming

* Add comments

* Variable renaming

* Code cleanup

* Make return type of decode() void

* Replace printing errors with throwing runtime_error

* Replaced runtime_error with TORCH_CHECK in demuxer.h

* Use CUDAGuard instead of cudaSetDevice

* Remove printf

* Use Tensor instead of uint8* and remove cuMemAlloc/cuMemFree

* Use TORCH_CHECK instead of runtime_error

* Use TORCHVISION_INCLUDE and TORCHVISION_LIBRARY to pass video codec location

* Include ffmpeg_include_dir

* Remove space

* Removed use of runtime_error

* Update Readme

* Check for bsf.h

* Change struct initialisation style

* Clean-up get_operating_point

* Make variable naming convention uniform

* Move checking for bsf.h around

* Fix linter error
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

* Revert "[FBcode->GH] remove unused requests functionality (#5014)"

This reverts commit 33123bee.

* Revert "replace requests with urllib (#4973)"

This reverts commit 8d25de7b.

* add requests as hard dependency

* install library stubs in CI

* fix syntax

* add requests to conda dependencies

* fix mypy CI

* chore: Updated pillow version specifier

* docs: Updated issue ref in comment

Co-authored-by: Nicolas Hug <nicolashug@fb.com>

* Removed unnecessary if from setup.py

* Removed empty line

* fix category file inclusion

* fix deprecated import

* add ufmt as code formatter

* cleanup

* quote ufmt requirement

* split imports into more groups

* regenerate circleci config

* fix CI

* clarify local testing utils section

* use ufmt pre-commit hook

* split relative imports into local category

* Revert "split relative imports into local category"

This reverts commit f2e224cde2008c56c9347c1f69746d39065cdd51.

* pin black and usort dependencies

* fix local test utils detection

* fix ufmt rev

* add reference utils to local category

* fix usort config

* remove custom categories sorting

* Run pre-commit without fixing flake8

* got a double import in merge
Co-authored-by: Nicolas Hug <nicolashug@fb.com>

* add prototype for `Caltech256` dataset

* silence mypy

* Enable building torchvision with ffmpeg regardless of version on Linux

* Skip tests with python 3.9

* Removed PY39_SKIP

* Cleaned up a bit

* Skip building torchvision with ffmpeg when python==3.9

* Add FIXME to comments

* Fix ffmpeg version

* Ignore platforms other than Linux for ffmpeg

* Removed unnecessary changes

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

* string manipulation for ffmpeg version retrieval

* ffmpeg version 4.2 control

* commenting solution

* removing all escapes for spaces
Co-authored-by: Vincent Moens <vmoens@fb.com>

* Added warning message for unsupported ffmpeg version

* Replaced os.popen with subprocess.run

* Removed capture_true argument

Do this after the version check to avoid failures on import for earlier
torch where that module did not exist.
See #3901
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

Co-authored-by: James Thewlis <james@unitary.ai>

* Proper error message

Now when there are missing ffmpeg libraries the error displayed is:
```
{0} header files were not found, disabling ffmpeg.
```
This is because the missing `.format`.

This PR fixes the warning message by appending the proper format operation.

* Use f-string
Co-authored-by: Prabhat Roy <prabhatroy@fb.com>

* bump to 5.3.0

* Also make 3.6 CI runs rely on 5.3.0

* 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

Co-authored-by: Philip Meier <pmeier.github@posteo.de>
Co-authored-by: Francisco Massa <fvsmassa@gmail.com>

This reverts commit 74de51d6.

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

* Encapsulate and standardize deform_conv2d (#3074)

* Rename files.

* Standardizing method names.

* Adding anonymous namespaces.

* Applying C++ naming rules and alinging variable names across headers and cpp files.

* Syncing names across implementations.

* Rename deform_conv2d.h to deform_conv2d.cpp

* Use header files:
- Create header files for kernel implementation and remove definitions from vision_*.h files.
- Eliminate unnecessary headers and ensure all cpp include their headers.

* Change the naming convention for kernel implementations.

* Remove the _param postfix from the variables and standardizing names.

* Exposing public forward/backward methods to the C++ API and moving methods around to minimize git blame changes.

* Encapsulate and standardize nms (#3081)

* Syncing, where possible, the names of functions across devices.

* Adding all internal functions in anonymous namespaces.

* Renaming C++/CUDA kernel files and moving operator code from header to cpp file.

* Create foreach cpp file a separate header file with "public" functions.

* Removing unnecessary repeated includes.

* Update CMakeLists.txt to include all headers.

* Encapsulate and standardize ps_roi_align (#3082)

* Renaming C++ files & methods according to recommended naming conventions and aligning them with Python's API.
Syncing, where possible, the names of functions across devices.

* Adding all internal functions in anonymous namespaces.

* Renaming C++/CUDA kernel files and moving operator code from header to cpp file.

* Create foreach cpp file a separate header file with "public" functions.

* Removing unnecessary repeated includes.

* Encapsulate and standardize ps_roi_pool (#3084)

* Renaming C++ files & methods according to recommended naming conventions and aligning them with Python's API.

* Adding all internal functions in anonymous namespaces.

* Renaming C++/CUDA kernel files and moving operator code from header to cpp file.

* Create foreach cpp file a separate header file with "public" functions.

* Removing unnecessary repeated includes.

* Encapsulate and standardize roi_align (#3085)

* Renaming C++ files & methods according to recommended naming conventions and aligning them with Python's API.

* Adding all internal functions in anonymous namespaces.

* Renaming C++/CUDA kernel files and moving operator code from header to cpp file.

* Create foreach cpp file a separate header file with "public" functions.

* Removing unnecessary repeated includes.

* Encapsulate and standardize roi_pool  (#3088)

* Renaming C++ files & methods according to recommended naming conventions and aligning them with Python's API.

* Adding all internal functions in anonymous namespaces.

* Syncing variable names between the cpp files and their header files.

* Renaming C++/CUDA kernel files and moving operator code from header to cpp file.

* Create foreach cpp file a separate header file with "public" functions.

* Removing unnecessary repeated includes.

* Encapsulate and standardize new_empty_tensor_op (#3089)

* Renaming C++ files & methods according to recommended naming conventions and aligning them with Python's API.

* Create foreach cpp file a separate header file with "public" functions.

* Adding all internal functions in anonymous namespaces.

* Convert to const ref all possible parameters.

* Removing unnecessary repeated includes.

* Encapsulate and standardize C++ Ops - Clean up (#3094)

* Removing unnecessary repeated includes.

* Remove unnecessary vision_cpu.h, vision_cuda.h, autocast.h.

* Fixing naming convention and correcting method names on macros.

* Turn on clang formatter for cu files and fixing broken styles.

* Replace "#ifndef ... #define ... #endif" with "#pragma once" on header files.

* Adding operator methods in vision::ops namespace. (#3096)

* Adding operator methods in vision::ops namespace.

* Replace general.h with macros.h

* Adding vision.h to the necessary cpp files.

* Fixes #2783
- Added "-fopenmp" cflags
- Refactored cxx flags creation

* Fixed for macosx

I.e. put all file system altering operations under `if __name__ == "__main__":`