Support v2.functional.gaussian_blur backprop

[andreasfloros]

Closes #8450

import torch
from torchvision.transforms.functional import gaussian_blur
from torchvision.transforms.v2.functional import gaussian_blur as gaussian_blur_v2

devices = ['cpu'] if not torch.cuda.is_available() else ['cpu', 'cuda']
k = 15

for device in devices:
    for blur in [gaussian_blur, gaussian_blur_v2]:
        torch.manual_seed(0)
        img = torch.randn(1, 3, 256, 256, device=device)
        s = torch.tensor(0.3 * ((5 - 1) * 0.5 - 1) + 0.8, requires_grad=True, device=device)
        blurred = blur(img, k, [s])
        blurred.mean().backward()
        print(s.grad)

tensor(-2.1697e-06)
tensor(-2.1695e-06)
tensor(4.1030e-06, device='cuda:0')
tensor(4.1030e-06, device='cuda:0')

cc @vfdev-5

[pytorch-bot]

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❌ 4 New Failures, 16 Unrelated Failures

As of commit 648efae with merge base 15a69ca ():

NEW FAILURES - The following jobs have failed:

• Lint / python-types / linux-job (gh)
  RuntimeError: Command docker exec -t 8e9ad701a43a681ffe43bfae66ef6ba2dbcdde0bc3d502869b6f8b841d167723 /exec failed with exit code 1
• Tests / unittests-linux (3.11, linux.12xlarge, cpu) / linux-job (gh)
  test/test_ops.py::TestRoIAlign::test_autocast_cpu[rois_dtype1-x_dtype1-False-True]
• Tests / unittests-macos (3.11, macos-m1-stable) / macos-job (gh)
  RuntimeError: operator torchvision::nms does not exist
• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
  test/test_ops.py::TestRoIAlign::test_autocast_cpu[rois_dtype1-x_dtype1-False-False]

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Tests / unittests-linux (3.10, linux.12xlarge, cpu) / linux-job (gh) (similar failure)
  test/test_io.py::TestVideo::test_write_video_with_audio[cuda]

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

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

• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cpu (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cuda11_8 (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cuda12_1 (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• Build Linux Conda / pytorch/vision / upload / conda-py3_8-cuda12_4 (gh) (trunk failure)
  Unable to find any artifacts for the associated workflow
• 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 (3.12, 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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[andreasfloros]

@NicolasHug I think the errors are unrelated, could you take a look?

[NicolasHug]

Thanks @andreasfloros