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

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# RefCOCO
## Overview
RefCOCO is a dataset for training and evaluating models on Referring Expression Comprehension (REC). It contains images, object bounding boxes, and free-form natural-language expressions that uniquely describe target objects within MSCOCO images.
## Task Description
- **Task Type**: Referring Expression Comprehension / Image Captioning
- **Input**: Image (with visualization) + referring expression
- **Output**: Bounding box coordinates or caption
- **Domains**: Visual grounding, object localization, image understanding
## Key Features
- Created via Amazon Mechanical Turk annotations
- Three evaluation modes:
- `bbox`: Image captioning with bounding box visualization
- `seg`: Image captioning with segmentation visualization
- `bbox_rec`: Grounding task - output normalized bounding box coordinates
- Expressions uniquely identify target objects in complex scenes
- Multiple subsets: test, val, testA, testB
## Evaluation Notes
- Evaluation mode configurable via `eval_mode` parameter
- Multiple metrics for comprehensive evaluation:
- Grounding: IoU, ACC@0.1/0.3/0.5/0.7/0.9, Center_ACC
- Captioning: BLEU (1-4), METEOR, ROUGE_L, CIDEr
- Bounding boxes output as normalized coordinates [x1/W, y1/H, x2/W, y2/H]
- Requires pycocoevalcap for caption metrics
## Properties
| Property | Value |
|----------|-------|
| **Benchmark Name** | `refcoco` |
| **Dataset ID** | [lmms-lab/RefCOCO](https://modelscope.cn/datasets/lmms-lab/RefCOCO/summary) |
| **Paper** | N/A |
| **Tags** | `Grounding`, `ImageCaptioning`, `Knowledge`, `MultiModal` |
| **Metrics** | `IoU`, `ACC@0.1`, `ACC@0.3`, `ACC@0.5`, `ACC@0.7`, `ACC@0.9`, `Center_ACC`, `Bleu_1`, `Bleu_2`, `Bleu_3`, `Bleu_4`, `METEOR`, `ROUGE_L`, `CIDEr` |
| **Default Shots** | 0-shot |
| **Evaluation Split** | `N/A` |
## Data Statistics
| Metric | Value |
|--------|-------|
| Total Samples | 17,596 |
| Prompt Length (Mean) | 146 chars |
| Prompt Length (Min/Max) | 146 / 146 chars |
**Per-Subset Statistics:**
| Subset | Samples | Prompt Mean | Prompt Min | Prompt Max |
|--------|---------|-------------|------------|------------|
| `test` | 5,000 | 146 | 146 | 146 |
| `val` | 8,811 | 146 | 146 | 146 |
| `testA` | 1,975 | 146 | 146 | 146 |
| `testB` | 1,810 | 146 | 146 | 146 |
**Image Statistics:**
| Metric | Value |
|--------|-------|
| Total Images | 13,785 |
| Images per Sample | min: 1, max: 1, mean: 1 |
| Resolution Range | 300x176 - 640x640 |
| Formats | jpeg |
## Sample Example
**Subset**: `test`
```json
{
"input": [
{
"id": "53a494fc",
"content": [
{
"text": "Please carefully observe the area circled in the image and come up with a caption for the area.\nAnswer the question using a single word or phrase."
},
{
"image": "[BASE64_IMAGE: jpeg, ~57.6KB]"
}
]
}
],
"target": "['guy petting elephant', 'foremost person', 'green shirt']",
"id": 0,
"group_id": 0,
"metadata": {
"question_id": "469306",
"iscrowd": 0,
"file_name": "COCO_train2014_000000296747_0.jpg",
"answer": [
"guy petting elephant",
"foremost person",
"green shirt"
],
"original_bbox": [
59.04999923706055,
93.23999786376953,
375.0199890136719,
362.5799865722656
],
"bbox": [],
"eval_mode": "bbox"
}
}
```
## Prompt Template
*No prompt template defined.*
## Extra Parameters
| Parameter | Type | Default | Description |
|-----------|------|---------|-------------|
| `eval_mode` | `str` | `bbox` | Control the evaluation mode used by RefCOCO. bbox: image caption task, visualize the original image with bounding box; seg: image caption task, visualize the original image with segmentation; bbox_rec: grounding task, recognize bounding box coordinates. Choices: ['bbox', 'seg', 'bbox_rec'] |
## Usage
### Using CLI
```bash
evalscope eval \
--model YOUR_MODEL \
--api-url OPENAI_API_COMPAT_URL \
--api-key EMPTY_TOKEN \
--datasets refcoco \
--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=['refcoco'],
dataset_args={
'refcoco': {
# subset_list: ['test', 'val', 'testA'] # optional, evaluate specific subsets
# extra_params: {} # uses default extra parameters
}
},
limit=10, # Remove this line for formal evaluation
)
run_task(task_cfg=task_cfg)
```