Fix use of cutmix_alpha in classification training references

[eminorhan]

Fixes #8440.

[pytorch-bot]

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❌ 8 New Failures

As of commit 561921c with merge base c585a51 ():

NEW FAILURES - The following jobs have failed:

• CMake / windows (windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-macos (3.10, macos-m1-stable) / macos-job (gh)
  test/test_transforms_v2.py::TestLinearTransform::test_transform[cpu-dtype1-make_image_tensor]
• Tests / unittests-macos (3.11, macos-m1-stable) / macos-job (gh)
  RuntimeError: operator torchvision::nms does not exist
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
  The process 'C:\Program Files\Git\cmd\git.exe' failed with exit code 128

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[NicolasHug]

Thanks for the report and for the fix @eminorhan !