Add types for crop_image_by_bounding_boxes.py

[RishikeshVepura]

Summary

• use modern built-in collection annotations
• mark class_names as optional to match its None default
• preserve the fixed-length crop-box tuple type
• enable mypy checking for crop_image_by_bounding_boxes.py

Part of #1635.

Testing

• make format
• make static-checks
• pytest tests/cli/test_cli_crop.py
• make all-checks

make all-checks completed with 1,468 passed and 209 skipped. One unrelated
distributed DCL test failed locally:

tests/utils/test_dist__gather__losses.py::TestGatherLayer_Losses::test_loss_dcl

The failure reproduces independently and does not involve the modified code.
All crop CLI tests passed.

Adds modern type annotations to crop_image_by_bounding_boxes.py, including optional class_names and fixed-length crop-box tuples. Enables mypy checks for the file.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 3e671d18-d8b5-4f79-9941-2c1ad06cac41

📥 Commits

Reviewing files that changed from the base of the PR and between 2e5fafb and 8297750.

📒 Files selected for processing (2)

• lightly/utils/cropping/crop_image_by_bounding_boxes.py
• pyproject.toml

💤 Files with no reviewable changes (1)

• pyproject.toml

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.

---

📝 Walkthrough

Walkthrough

Changes

Typed cropping module

Layer / File(s)	Summary
Cropping annotations and mypy coverage lightly/utils/cropping/crop_image_by_bounding_boxes.py, pyproject.toml	The cropping function uses built-in generic annotations and an explicit nullable class_names type. Local annotations use the same syntax. Crop coordinates convert directly to integers. Mypy now checks the module.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 82977

This change modernizes cropping type annotations, correctly represents optional class names, and enables type checking without an identified behavior regression. It is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding type annotations to crop_image_by_bounding_boxes.py.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 1 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}