Datasets:
| """The one mapping between a model's ``category_id`` and a ``use_case_id``. | |
| Ground truth stores violation codes zero-padded (``U03``); models emit them as | |
| plain integers (``3``). Getting the padding wrong does not raise — it produces a | |
| label that matches nothing, so every single-digit class silently becomes a false | |
| positive and a phantom row in the report. | |
| This lived as a copy-pasted one-liner in both metric modules and was wrong in | |
| both. It is one function now so it can only ever be wrong in one place. | |
| """ | |
| from __future__ import annotations | |
| # Violation codes are two digits in the taxonomy (U01-U97). Wider ids are passed | |
| # through unpadded rather than truncated, so an out-of-range id stays visible as | |
| # an unknown label instead of colliding with a real one. | |
| _CODE_WIDTH = 2 | |
| def to_use_case_id(category_id: int) -> str: | |
| """Map an integer ``category_id`` to its ``use_case_id``. | |
| ``3`` -> ``"U03"``, ``17`` -> ``"U17"``. | |
| """ | |
| return f"U{category_id:0{_CODE_WIDTH}d}" | |
| def to_category_id(use_case_id: str) -> int: | |
| """Inverse of :func:`to_use_case_id`. ``"U03"`` -> ``3``.""" | |
| return int(use_case_id.lstrip("Uu")) | |