Remove extraneous device conversions in raft

[vbarrielle]

By default, these calls were allocating tensors on the CPU, to then convert to the device used in the rest of the model. It's faster to allocate them directly on the correct device.

I have measured these changes on my machine to reduce the runtime of the forward pass by 25%.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/8500

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❌ 3 New Failures, 12 Unrelated Failures

As of commit 0714fdb with merge base 3e60dbd ():

NEW FAILURES - The following jobs have failed:

• Lint / python-types / linux-job (gh)
  RuntimeError: Command docker exec -t f2fc3c69822d3ffd0659d62085732079fec4eb68ca3785a82e175c930c98f5c3 /exec failed with exit code 1
• Tests / unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
  RuntimeError: Command docker exec -t 2c07e9591089637ff95a7f8c67c0455a16201d0c8a8391c3634b18b69a2e7efa /exec failed with exit code 1
• Tests / unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)
  Process completed with exit code 1.

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Windows Conda / pytorch/vision / upload / conda-py3_8-cpu (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/vision / upload / conda-py3_8-cuda11_8 (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/vision / upload / conda-py3_8-cuda12_1 (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• Build Windows Conda / pytorch/vision / upload / conda-py3_8-cuda12_4 (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• Tests / unittests-linux (3.10, linux.12xlarge, cpu) / linux-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]
• Tests / unittests-linux (3.12, linux.12xlarge, cpu) / linux-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]
• Tests / unittests-linux (3.8, linux.12xlarge, cpu) / linux-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]
• Tests / unittests-linux (3.9, linux.12xlarge, cpu) / linux-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]
• Tests / unittests-macos (3.10, macos-m1-stable) / macos-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]
• Tests / unittests-macos (3.12, macos-m1-stable) / macos-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]
• Tests / unittests-macos (3.8, macos-m1-stable) / macos-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]
• Tests / unittests-macos (3.9, macos-m1-stable) / macos-job (gh) (trunk failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]

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[NicolasHug]

Thanks for the PR @vbarrielle . PR looks good. Please make sure to sign the CLA for us to be able to merge your contribution!
Thank you