Matcherrorrate

---
name: matcherrorrate
description: Compute the MatchErrorRate metric — provided by torchmetrics. Use when the user has predictions and ground-truth and needs to compute MatchErrorRate, or asks how to score with MatchErrorRate.
metadata:
  skill_kind: metric
  source_lib: torchmetrics
  import_path: torchmetrics.MatchErrorRate
  source: library_introspection
---

# matcherrorrate

> Metric `MatchErrorRate` from `torchmetrics` (torchmetrics.MatchErrorRate)

## When to invoke this skill

The user has predictions + ground truth and asks to evaluate with MatchErrorRate, or
mentions `torchmetrics.MatchErrorRate` directly, or wants the standard torchmetrics implementation.

## Reference signature

```python
from torchmetrics import MatchErrorRate

# _MatchErrorRate(**kwargs: Any) -> None
```

## Library docstring

```
Wrapper for deprecated import.

>>> preds = ["this is the prediction", "there is an other sample"]
>>> target = ["this is the reference", "there is another one"]
>>> mer = _MatchErrorRate()
>>> mer(preds, target)
tensor(0.4444)
```

## Quick recipe

```python
import torchmetrics as _m
score = _m.MatchErrorRate(y_true, y_pred)
```

## Don'ts

- Don't reimplement when the library version handles edge cases (NaN, ties, empty inputs) better than a hand-rolled formula.
- Always check the library version's argument order — sklearn is `(y_true, y_pred)` while torchmetrics is `(preds, target)`.