fix(datasets): SUN397 mirror fallbacks and clearer download errors

.github/workflows/fork-smoke.yml

@@ -0,0 +1,30 @@
+name: Fork Smoke Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  smoke-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.12]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .
+    - name: Run smoke test
+      run: |
+        python -c "import torchvision; print(torchvision.__version__)"

.gitignore

@@ -45,3 +45,7 @@ xcuserdata/
 .envrc
 
 scripts/release_notes/data.json
+.aider*
+
+__pycache__/
+.pytest_cache/

FORK.md

@@ -0,0 +1,14 @@
+# Nueramarcos Fork of torchvision
+
+Personal fork of [pytorch/vision](https://github.com/pytorch/vision).
+
+## Install
+
+```bash
+git clone https://github.com/Nueramarcos/vision.git
+cd vision
+pip install -e .
+python -c "import torchvision; print(torchvision.__version__)"
+```
+
+Maintained by [Nueramarcos](https://github.com/Nueramarcos).

README.md

@@ -1,5 +1,13 @@
 # torchvision
 
+## Fork Notice
+
+Maintained by [Nueramarcos](https://github.com/Nueramarcos). See [FORK.md](FORK.md).
+
+[![License](https://img.shields.io/github/license/pytorch/vision)](https://github.com/pytorch/vision/blob/main/LICENSE)
+[![Language](https://img.shields.io/github/languages/top/pytorch/vision?color=blue)](https://github.com/pytorch/vision/search?q=language:)
+[![Fork Smoke](https://github.com/Nueramarcos/vision/actions/workflows/fork-smoke.yml/badge.svg)](https://github.com/Nueramarcos/vision/actions/workflows/fork-smoke.yml)
+
 [![total torchvision downloads](https://pepy.tech/badge/torchvision)](https://pepy.tech/project/torchvision)
 [![documentation](https://img.shields.io/badge/dynamic/json.svg?label=docs&url=https%3A%2F%2Fpypi.org%2Fpypi%2Ftorchvision%2Fjson&query=%24.info.version&colorB=brightgreen&prefix=v)](https://pytorch.org/vision/stable/index.html)
 
@@ -27,7 +35,6 @@ versions.
 | `2.9`              | `0.24`             | `>=3.10`, `<=3.14`  |
 | `2.8`              | `0.23`             | `>=3.9`, `<=3.13`   |
 | `2.7`              | `0.22`             | `>=3.9`, `<=3.13`   |
-| `2.6`              | `0.21`             | `>=3.9`, `<=3.12`   |
 
 <details>
     <summary>older versions</summary>
@@ -66,7 +73,7 @@ Torchvision currently supports the following image backends:
     - [Pillow](https://python-pillow.org/)
     - [Pillow-SIMD](https://github.com/uploadcare/pillow-simd) - a **much faster** drop-in replacement for Pillow with SIMD.
 
-Read more in in our [docs](https://pytorch.org/vision/stable/transforms.html).
+Read more in our [docs](https://pytorch.org/vision/stable/transforms.html).
 
 ## Documentation
 
@@ -109,3 +116,4 @@ If you find TorchVision useful in your work, please consider citing the followin
     howpublished = {\url{https://github.com/pytorch/vision}}
 }
 ```
+```

torchvision/datasets/sun397.py

@@ -1,5 +1,6 @@
 from pathlib import Path
 from typing import Any, Callable, Optional, Union
+from urllib.error import URLError
 
 from .folder import default_loader
 
@@ -26,8 +27,11 @@ class SUN397(VisionDataset):
             ``torchvision.io.decode_image`` for decoding image data into tensors directly.
     """
 
-    _DATASET_URL = "http://vision.princeton.edu/projects/2010/SUN/SUN397.tar.gz"
     _DATASET_MD5 = "8ca2778205c41d23104230ba66911c7a"
+    _DATASET_MIRRORS = (
+        "https://vision.princeton.edu/projects/2010/SUN/SUN397.tar.gz",
+        "http://vision.princeton.edu/projects/2010/SUN/SUN397.tar.gz",
+    )
 
     def __init__(
         self,
@@ -78,4 +82,22 @@ def _check_exists(self) -> bool:
     def _download(self) -> None:
         if self._check_exists():
             return
-        download_and_extract_archive(self._DATASET_URL, download_root=self.root, md5=self._DATASET_MD5)
+
+        errors: list[BaseException] = []
+        for url in self._DATASET_MIRRORS:
+            try:
+                download_and_extract_archive(url, download_root=self.root, md5=self._DATASET_MD5)
+                return
+            except (RuntimeError, URLError) as err:
+                errors.append(err)
+
+        msg = "Error downloading SUN397:\n"
+        for url, err in zip(self._DATASET_MIRRORS, errors):
+            msg += f"Tried {url}, got:\n{err}\n"
+        msg += (
+            "The Princeton and MIT mirrors for SUN397 are currently unavailable. "
+            "Download the archive manually and extract it under <root>/SUN397/. "
+            "See https://github.com/pytorch/vision/issues/9348 and "
+            "https://github.com/pytorch/vision/issues/7637 (dataset mirroring)."
+        )
+        raise RuntimeError(msg)