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See documentation:
https://cmake.org/cmake/help/latest/module/FindPython3.html
Successful workflow:
https://github.com/pytorch/test-infra/actions/runs/13381336461/job/37371953479?pr=6

Differential Revision: D50677606

Pull Request resolved: https://github.com/pytorch/audio/pull/3681

Differential Revision: D50633306

Pull Request resolved: https://github.com/pytorch/audio/pull/3675

Differential Revision: D49965263

Pull Request resolved: https://github.com/pytorch/audio/pull/3639

Summary:
* Remove MKL and NumPy from Conda build env
* Remove `caffe2::mkl` dependency from `torch_cpu`, which introduced unnecessary and undesided dependency on Intel mac.

TorchAudio does not use BLAS libraries directly, thus all the mentions to MKL should be removed from the codebase.
However, this was causing an issue on Intel mac. It turned out that `torch_cpu` target is pulling `caffe2::mkl` dependency, and the linker on macOS keeps library dependency even if no symbol from that library is used. This stray mkl dependency should be fixed on core side, but also we can modify the target temporarily and remove them.

Also we don't need NumPy on build/run time, so that is removed as well.

Pull Request resolved: https://github.com/pytorch/audio/pull/3307

Reviewed By: atalman

Differential Revision: D45606944

Pulled By: mthrok

fbshipit-source-id: 853411ccbbca31796b808a2b052b4cfa564718cd

Summary: Pull Request resolved: https://github.com/pytorch/audio/pull/2930

Reviewed By: carolineechen, nateanl

Differential Revision: D42280966

Pulled By: mthrok

fbshipit-source-id: f9d5f1dc7c1a62d932fb2020aafb63734f2bf405

Summary:
This commit makes the following changes to the C++ library organization
- Move sox-related feature implementations from `libtorchaudio` to `libtorchaudio_sox`.
- Remove C++ implementation of `is_sox_available` and `is_ffmpeg_available` as it is now sufficient to check the existence of `libtorchaudio_sox` and `libtorchaudio_ffmpeg` to check the availability. This makes `libtorchaudio_sox` and `libtorchaudio_ffmpeg` independent from `libtorchaudio`.
- Move PyBind11-based bindings (`_torchaudio_sox`, `_torchaudio_ffmpeg`) into `torchaudio.lib` so that the built library structure is less cluttered.

Background:
Originally, when the `libsox` was the only C++ extension and `libtorchaudio` was supposed to contain all the C++ code.
The things are different now. We have a bunch of C++ extensions and we need to make the code/build structure more modular.

The new `libtorchaudio_sox` contains the implementations and `_torchaudio_sox` contains the PyBin11-based bindings.

Pull Request resolved: https://github.com/pytorch/audio/pull/2929

Reviewed By: hwangjeff

Differential Revision: D42159594

Pulled By: mthrok

fbshipit-source-id: 1a0fbca9e4143137f6363fc001b2378ce6029aa7

Summary:
Extract the helper functions for defining library and extension so that they can be reused for building flashlight library and binding in https://github.com/pytorch/audio/issues/2580.

Pull Request resolved: https://github.com/pytorch/audio/pull/2585

Reviewed By: carolineechen

Differential Revision: D38233407

Pulled By: mthrok

fbshipit-source-id: 96f7c62a8b70bb3ff5caede9730165d54a55272f