2026-07-08 08:57:50 +00:00

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# MuSR
## Overview
MuSR (Multistep Soft Reasoning) is a benchmark for evaluating complex reasoning abilities through narrative-based problems. It includes murder mysteries, object placements, and team allocation scenarios requiring multi-step inference.
## Task Description
- **Task Type**: Complex Reasoning (Multiple-Choice)
- **Input**: Narrative scenario with question and answer choices
- **Output**: Correct answer letter (A-F)
- **Domains**: Murder mysteries, object tracking, team allocation
## Key Features
- Narrative-based reasoning problems
- Requires multi-step logical inference
- Three distinct reasoning domains
- Tests constraint satisfaction and deduction
- Longer context requiring careful reasoning
## Evaluation Notes
- Default configuration uses **0-shot** evaluation
- Uses Chain-of-Thought (CoT) prompting
- Three subsets: `murder_mysteries`, `object_placements`, `team_allocation`
- Simple accuracy metric
- Challenging benchmark requiring careful reading
## Properties
| Property | Value |
|----------|-------|
| **Benchmark Name** | `musr` |
| **Dataset ID** | [AI-ModelScope/MuSR](https://modelscope.cn/datasets/AI-ModelScope/MuSR/summary) |
| **Paper** | N/A |
| **Tags** | `MCQ`, `Reasoning` |
| **Metrics** | `acc` |
| **Default Shots** | 0-shot |
| **Evaluation Split** | `test` |
## Data Statistics
| Metric | Value |
|--------|-------|
| Total Samples | 756 |
| Prompt Length (Mean) | 4891.57 chars |
| Prompt Length (Min/Max) | 2812 / 7537 chars |
**Per-Subset Statistics:**
| Subset | Samples | Prompt Mean | Prompt Min | Prompt Max |
|--------|---------|-------------|------------|------------|
| `murder_mysteries` | 250 | 5743.1 | 4056 | 7537 |
| `object_placements` | 256 | 5294.0 | 3735 | 7525 |
| `team_allocation` | 250 | 3627.93 | 2812 | 4351 |
## Sample Example
**Subset**: `murder_mysteries`
```json
{
"input": [
{
"id": "5ec1a7bd",
"content": "Answer the following multiple choice question. The last line of your response should be of the following format: 'ANSWER: [LETTER]' (without quotes) where [LETTER] is one of A,B. Think step by step before answering.\n\nIn an adrenaline inducing ... [TRUNCATED] ... and wronged, over and over, at the same sight. It was quite a sight. \n\nWinston, shuffling back to the station, was left with one thought - Looks like Mackenzie had quite an eventful week.\n\nWho is the most likely murderer?\n\nA) Mackenzie\nB) Ana"
}
],
"choices": [
"Mackenzie",
"Ana"
],
"target": "A",
"id": 0,
"group_id": 0
}
```
*Note: Some content was truncated for display.*
## Prompt Template
**Prompt Template:**
```text
Answer the following multiple choice question. The last line of your response should be of the following format: 'ANSWER: [LETTER]' (without quotes) where [LETTER] is one of {letters}. Think step by step before answering.
{question}
{choices}
```
## Usage
### Using CLI
```bash
evalscope eval \
--model YOUR_MODEL \
--api-url OPENAI_API_COMPAT_URL \
--api-key EMPTY_TOKEN \
--datasets musr \
--limit 10 # Remove this line for formal evaluation
```
### Using Python
```python
from evalscope import run_task
from evalscope.config import TaskConfig
task_cfg = TaskConfig(
model='YOUR_MODEL',
api_url='OPENAI_API_COMPAT_URL',
api_key='EMPTY_TOKEN',
datasets=['musr'],
dataset_args={
'musr': {
# subset_list: ['murder_mysteries', 'object_placements', 'team_allocation'] # optional, evaluate specific subsets
}
},
limit=10, # Remove this line for formal evaluation
)
run_task(task_cfg=task_cfg)
```