---
license: cc-by-nc-4.0
datasets:
- openbmb/VisRAG-Ret-Train-Synthetic-data
- openbmb/VisRAG-Ret-Train-In-domain-data
- Metric-AI/rag_docmatix_100k
- vidore/colpali_train_set
- llamaindex/vdr-multilingual-train
- Metric-AI/tabfquad_train_set
language:
- en
- fr
- es
- it
- de
base_model:
- Metric-AI/ColQwenStella-base-2b
- Qwen/Qwen2-VL-2B
- NovaSearch/stella_en_1.5B_v5
tags:
- vidore
- multimodal_embedding
- multilingual_embedding
- Text-to-Visual Document (T→VD) retrieval
library_name: peft
pipeline_tag: visual-document-retrieval
---
# ColQwenStella-2b-multilingual: Multilingual Visual Retriever based on the combination of Qwen2 Vision and stella_en_1.5B_v5 model. 

## Ranked #1 among models <= 2B parameters and #8 overall on the Vidore benchmark (as of February 11, 2025). The reported scores on the [Vidore Leaderboard](https://huggingface.co/spaces/vidore/vidore-leaderboard) correspond to checkpoint-1800.

### This is the base version trained on 4xA100 80GB with per_device_batch_size=128 for 5 epoch. 

The ColQwenStella-2b-multilingual architecture combines the Vision component of the Qwen2 model with stella_en_1.5B_v5 as its embedding model. Training is done following the [ColPali: Efficient Document Retrieval with Vision Language Models](https://arxiv.org/abs/2407.01449) recipe.


## Data
- **Synthetic data**: Selected and preprocessed from the `openbmb/VisRAG-Ret-Train-Synthetic-data` dataset.  
- **In-domain VQA dataset**: Drawn from `openbmb/VisRAG-Ret-Train-In-domain-data`.  
- **Docmatix dataset**: Extracted from the `Metric-AI/rag_docmatix_100k` dataset.  
- **Colpali dataset**: Taken from `vidore/colpali_train_set`.
- **Multilingual dataset**: Taken from `llamaindex/vdr-multilingual-train`.


## Model Training

### Parameters
We train models  use low-rank adapters ([LoRA](https://arxiv.org/abs/2106.09685)) 
with `alpha=128`  and `r=128` on the transformer layers from the language model, and `mlp` layers of the `vison_model.merger`
as well as the final randomly initialized projection layer, and use a `adamw` optimizer. 
We train on an 4xA100 GPU setup with distributed data parallelism (via accelerate), a learning rate of 5e-4 with cosine decay with 100 warmup steps, batch size per device is 128, in `bfloat16` format.

## Installation

```bash
pip install transformers>=4.46.3
```

## Usage

```python
import torch
from PIL import Image

from transformers import AutoModel, AutoProcessor

model = AutoModel.from_pretrained(
        "Metric-AI/ColQwenStella-2b-multilingual",
        torch_dtype=torch.bfloat16,
        device_map="cuda:0",  # or "mps" if on Apple Silicon
        trust_remote_code=True
    ).eval()
processor = AutoProcessor.from_pretrained("Metric-AI/ColQwenStella-2b-multilingual", trust_remote_code=True)

# Your inputs
images = [
    Image.new("RGB", (32, 32), color="white"),
    Image.new("RGB", (16, 16), color="black"),
]
queries = [
    "Is attention really all you need?",
    "What is the amount of bananas farmed in Salvador?",
]

# Process the inputs
batch_images = processor.process_images(images).to(model.device)
batch_queries = processor.process_queries(queries).to(model.device)

# Forward pass
with torch.no_grad():
    image_embeddings = model(**batch_images)
    query_embeddings = model(**batch_queries)

scores = processor.score_multi_vector(query_embeddings, image_embeddings)
```

## License

The adapters attached to the model are under MIT license.


- **Developed by:** [Metric AI Research Lab](https://metric.am/)