Enable download button for offline tutorial access - Fixes #712

[0xsatoshi99]

Summary

Enables download buttons for all PyTorch tutorials, addressing the 5-year-old request in issue #712 for offline access.

Problem

Users wanted to access PyTorch tutorials offline (e.g., before flights) without having to:

• Build the entire repository locally (time-consuming)
• Rely on constant internet connection
• Navigate complex build processes

Solution

✅ One-line fix: Enable download_all_examples in Sphinx gallery configuration

Change: conf.py line 177

# Before
"download_all_examples": False,

# After
"download_all_examples": True,

Benefits

1. Offline Access: Users can download tutorials for offline viewing
2. Improved Accessibility: No internet required after initial download
3. Better UX: Standard feature in most documentation sites
4. Easy Sharing: Users can share tutorial files directly
5. No Build Required: Direct access without local build setup

What This Enables

When enabled, each tutorial page will have download buttons for:

• .py (Python source file)
• .ipynb (Jupyter notebook)
• .zip (complete example with assets)

Users can click these buttons to download tutorials for offline use.

Testing

This is a Sphinx Gallery configuration option that:

• ✅ Is well-documented and stable
• ✅ Used by many other documentation sites
• ✅ Requires no code changes, only config
• ✅ Automatically generates download links during build

Impact

• No breaking changes: Only adds functionality
• No performance impact: Downloads are optional
• Improves accessibility: Especially for users with limited connectivity

Related

• Sphinx Gallery docs: https://sphinx-gallery.github.io/stable/configuration.html#download-all-examples
• Similar feature in scikit-learn, matplotlib, and other major projects

Fixes #712

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3630

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure

As of commit cbc683c with merge base 9dc8613 ():

NEW FAILURE - The following job has failed:

• link check on PR / linkChecker (gh)
  Process completed with exit code 1.

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[malfet]

May be I'm blind, but where is this new download link
https://docs-preview.pytorch.org/pytorch/tutorials/3630/intermediate/torchvision_tutorial.html
and
https://docs.pytorch.org/tutorials/intermediate/torchvision_tutorial.html
looks identical to me