Expose transforms.v2 utils for writing custom transforms.

[venkatram-dev]

#7785 (comment)

pytest test/test_transforms_v2.py -vvv -k test_functional test/test_transforms_v2.py::TestQuerySize::test_functional[pure_tensor] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[tv_tensor_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[pil_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[tv_tensor_video] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[tv_tensor_mask] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[pure_tensor] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[tv_tensor_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[pil_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[tv_tensor_video] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[tv_tensor_mask] PASSED [100%] 

cc @vfdev-5

[pytorch-bot]

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❌ 4 New Failures

As of commit 1f24d8f with merge base 9832166 ():

NEW FAILURES - The following jobs have failed:

• Build Windows Conda / pytorch/vision / upload / conda-py3_9-cuda12_4 (gh)
  ##[error]Unable to find an artifact with the name: pytorch_vision__3.9_cu124_
• Lint / c-source / linux-job (gh)
  RuntimeError: Command docker exec -t ddcac53df44e430cfe4e33023b75c19003fe71d5472ec9731cb8dcbf8c463946 /exec failed with exit code 1
• Tests / unittests-linux (3.12, linux.12xlarge, cpu) / linux-job (gh)
  ##[error]fatal: couldn't find remote ref refs/pull/8670/merge
• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)
  ##[error]fatal: couldn't find remote ref refs/pull/8670/merge

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[venkatram-dev]

pytest test/test_transforms_v2.py -vvv -k test_functional test/test_transforms_v2.py::TestQuerySize::test_functional[pure_tensor] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[tv_tensor_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[pil_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[tv_tensor_video] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional[tv_tensor_mask] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[pure_tensor] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[tv_tensor_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[pil_image] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[tv_tensor_video] PASSED [ 99%] test/test_transforms_v2.py::TestQuerySize::test_functional_mixed_types[tv_tensor_mask] PASSED [100%] 

[NicolasHug]

Thanks for the initial PR @venkatram-dev . Note that tests were failing for different reasons, the main one being that query_size was imported from the wrong module (I assume your code changed since you last tested?)

I fixed and cleaned up the tests, added some more test cases, and exposed a few more utils. Thank you!