Put back StanfordCars.download (the function, NOT the feature)

[NicolasHug]

The download() method was removed in #8309 but since it's public it's best to keep it and raise the error there. Addresses #8309 (comment) which I missed - sorry

test:

[ins] In [1]: from torchvision.datasets import StanfordCars
[ins] In [2]: StanfordCars(root="/tmp", download=True)
         ...: 
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-2-a557e888a29e> in <module>
----> 1 StanfordCars(root="/tmp", download=True)

~/dev/vision/torchvision/datasets/stanford_cars.py in __init__(self, root, split, transform, target_transform, download)
     62 
     63         if download:
---> 64             self.download()
     65 
     66         if not self._check_exists():

~/dev/vision/torchvision/datasets/stanford_cars.py in download(self)
    102 
    103     def download(self):
--> 104         raise ValueError(
    105             "The original URL is broken so the StanfordCars dataset is not available for automatic "
    106             "download anymore. You can try to download it manually following "

ValueError: The original URL is broken so the StanfordCars dataset is not available for automatic download anymore. You can try to download it manually following https://github.com/pytorch/vision/issues/7545#issuecomment-1631441616, and set download=False to avoid this error.

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❌ 12 New Failures, 1 Pending, 23 Unrelated Failures

As of commit 8acff3b with merge base 4028d9f ():

NEW FAILURES - The following jobs have failed:

• CMake / macos (macos-12) / macos-job (gh)
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• CMake / windows (windows.4xlarge, cpu) / windows-job (gh)
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• Tests / unittests-macos (3.10, macos-12) / macos-job (gh)
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• Tests / unittests-macos (3.11, macos-12) / macos-job (gh)
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• Tests / unittests-macos (3.12, macos-12) / macos-job (gh)
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• Tests / unittests-macos (3.8, macos-12) / macos-job (gh)
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• Tests / unittests-macos (3.9, macos-12) / macos-job (gh)
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• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh)
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• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh)
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• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh)
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• Tests / unittests-windows (3.8, windows.4xlarge, cpu) / windows-job (gh)
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• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh)
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FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• CMake / linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• CMake / macos (macos-m1-stable) / macos-job (gh)
• CMake / windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)
• Docs / build / linux-job (gh)
• Lint / python-source-and-configs / linux-job (gh)
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• Prototype tests on Linux / unittests-prototype (3.10, linux.12xlarge, cpu) / linux-job (gh)
• Prototype tests on Linux / unittests-prototype (3.11, linux.12xlarge, cpu) / linux-job (gh)
• Prototype tests on Linux / unittests-prototype (3.12, linux.12xlarge, cpu) / linux-job (gh)
• Prototype tests on Linux / unittests-prototype (3.8, linux.12xlarge, cpu) / linux-job (gh)
• Prototype tests on Linux / unittests-prototype (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• Prototype tests on Linux / unittests-prototype (3.9, linux.12xlarge, cpu) / linux-job (gh)
• Tests / onnx / linux-job (gh)
• Tests / unittests-linux (3.10, linux.12xlarge, cpu) / linux-job (gh)
• Tests / unittests-linux (3.11, linux.12xlarge, cpu) / linux-job (gh)
• Tests / unittests-linux (3.12, linux.12xlarge, cpu) / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• Tests / unittests-linux (3.8, linux.12xlarge, cpu) / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• Tests / unittests-linux (3.8, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• Tests / unittests-linux (3.9, linux.12xlarge, cpu) / linux-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• Tests / unittests-windows (3.8, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh)

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

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

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