[laclance]

Part of #1635.

Summary

• add type annotations to lightly/utils/debug.py and tests/utils/test_debug.py
• remove both files from the mypy exclusion list
• improve optional matplotlib handling by keeping the pyplot module separate from import errors
• remove an unused torchvision import
• preserve the invalid-transform test with a targeted # type: ignore[arg-type]

Validation

• make type-check
• make format-check
• uv run --frozen pytest tests/utils/test_debug.py — 11 passed

Add type annotations to lightly/utils/debug.py and tests/utils/test_debug.py. Remove both files from the mypy exclusion list. Keep Matplotlib import errors separate from pyplot, and retain the invalid-transform test with a targeted type ignore.

The author reports that type checks, formatting checks, and the debug utility tests passed (11 tests).

[coderabbitai]

No actionable comments were generated in the recent review.

Recent review info

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• Run ID: e541b1f8-0b88-4bcd-b014-31c0b0fc1c10

Commits

Reviewing files that changed from the base of the PR and between 0c966b1 and 40c50c1.

Files selected for processing: 1

• tests/utils/test_debug.py

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Walkthrough

The debug utility stores Matplotlib import failures separately and retrieves pyplot when plotting. The changes add annotations to the plotting function, transform parameter, and tests. Mypy no longer excludes the utility or its tests.

Changes: Debug utility

Layer / File(s)	Summary
Pyplot import and plotting access lightly/utils/debug.py, tests/utils/test_debug.py	The module stores pyplot or its import error. The plotting function retrieves pyplot through a helper and uses it to create the figure and subplots. Tests load pyplot through importlib.
Transform annotations and type checking lightly/utils/debug.py, pyproject.toml, tests/utils/test_debug.py	The transform parameter gains an Any annotation, while the existing transform dispatch remains in place. Mypy exclusions are removed, and test helpers and methods gain annotations.

Priority: Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Refactor

Possibly related PRs

• lightly-ai/lightly#2070: Both PRs remove stale mypy exclusions from pyproject.toml; this PR removes exclusions for the debug utility and its tests.

Suggested reviewers: philippmwirth

Merge Risk: Minimal · up to 40c50

No actionable merge-blocking risk is established for this PR.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 30.77% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 13 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: adding type annotations to the debug utilities and related test code.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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