# Retrievalmrr

> Compute the RetrievalMRR metric — provided by torchmetrics. Use when the user has predictions and ground-truth and needs to compute RetrievalMRR, or asks how to score with RetrievalMRR.

- Skill: `qhjqhj00/retrievalmrr` (Agent Skill)
- Install (CLI): `npx skillmds add qhjqhj00/retrievalmrr`
- Raw SKILL.md: https://api.skillmd.com/api/skills/qhjqhj00/retrievalmrr/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: qhjqhj00 (https://skillmd.com/u/qhjqhj00)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/qhjqhj00/retrievalmrr

---


# retrievalmrr

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

## When to invoke this skill

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

## Reference signature

```python
from torchmetrics import RetrievalMRR

# _RetrievalMRR(empty_target_action: str = 'neg', ignore_index: Optional[int] = None, **kwargs: Any) -> None
```

## Library docstring

```
Wrapper for deprecated import.

>>> from torch import tensor
>>> indexes = tensor([0, 0, 0, 1, 1, 1, 1])
>>> preds = tensor([0.2, 0.3, 0.5, 0.1, 0.3, 0.5, 0.2])
>>> target = tensor([False, False, True, False, True, False, True])
>>> mrr = _RetrievalMRR()
>>> mrr(preds, target, indexes=indexes)
tensor(0.7500)
```

## Quick recipe

```python
import torchmetrics as _m
score = _m.RetrievalMRR(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)`.