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VisRAG: Vision-based Retrieval-augmented Generation on Multi-modality Documents

📖 Introduction

VisRAG is a novel vision-language model (VLM)-based RAG pipeline. In this pipeline, instead of first parsing the document to obtain text, the document is directly embedded using a VLM as an image and then retrieved to enhance the generation of a VLM. Compared to traditional text-based RAG, VisRAG maximizes the retention and utilization of the data information in the original documents, eliminating the information loss introduced during the parsing process.

🎉 News

• 20241111: Released our VisRAG Pipeline on GitHub, now supporting visual understanding across multiple PDF documents.
• 20241104: Released our VisRAG Pipeline on Hugging Face Space.
• 20241031: Released our VisRAG Pipeline on Colab. Released codes for converting files to images which could be found at scripts/file2img.
• 20241015: Released our train data and test data on Hugging Face which can be found in the VisRAG Collection on Hugging Face. It is referenced at the beginning of this page.
• 20241014: Released our Paper on arXiv. Released our Model on Hugging Face. Released our Code on GitHub.

✨ VisRAG Pipeline

VisRAG-Ret

VisRAG-Ret is a document embedding model built on MiniCPM-V 2.0, a vision-language model that integrates SigLIP as the vision encoder and MiniCPM-2B as the language model.

VisRAG-Gen

In the paper, We use MiniCPM-V 2.0, MiniCPM-V 2.6 and GPT-4o as the generators. Actually, you can use any VLMs you like!

⚙️ Setup

conda create --name VisRAG python==3.10.8
conda install nvidia/label/cuda-11.8.0::cuda-toolkit
cd VisRAG
pip install -r requirements.txt
pip install -e .
cd timm_modified
pip install -e .
cd ..

Note:

1. timm_modified is an enhanced version of the timm library that supports gradient checkpointing, which we use in our training process to reduce memory usage.

⚡️ Training

VisRAG-Ret

Our training dataset of 362,110 Query-Document (Q-D) Pairs for VisRAG-Ret is comprised of train sets of openly available academic datasets (34%) and a synthetic dataset made up of pages from web-crawled PDF documents and augmented with VLM-generated (GPT-4o) pseudo-queries (66%).

bash scripts/train_retriever/train.sh 2048 16 8 0.02 1 true false config/deepspeed.json 1e-5 false wmean causal 1 true 2 false <model_dir> <repo_name_or_path>

Note:

1. Our training data can be found in the VisRAG collection on Hugging Face, referenced at the beginning of this page. Please note that we have separated the In-domain-data and Synthetic-data due to their distinct differences. If you wish to train with the complete dataset, you’ll need to merge and shuffle them manually.
2. The parameters listed above are those used in our paper and can be used to reproduce the results.
3. <repo_name_or_path> can be any of the following: openbmb/VisRAG-Ret-Train-In-domain-data, openbmb/VisRAG-Ret-Train-Synthetic-data, the directory path of a repository downloaded from Hugging Face, or the directory containing your own training data.
4. If you wish to train using your own datasets, remove the --from_hf_repo line from the train.sh script. Additionally, ensure that your dataset directory contains a metadata.json file, which must include a length field specifying the total number of samples in the dataset.
5. Our training framework is modified based on OpenMatch.

VisRAG-Gen

The generation part does not use any fine-tuning, we directly use off-the-shelf LLMs/VLMs for generation.

📃 Evaluation

VisRAG-Ret

bash scripts/eval_retriever/eval.sh 512 2048 16 8 wmean causal ArxivQA,ChartQA,MP-DocVQA,InfoVQA,PlotQA,SlideVQA <ckpt_path>

Note:

1. Our test data can be found in the VisRAG Collection on Hugging Face, which is referenced at the beginning of this page.
2. The parameters listed above are those used in our paper and can be used to reproduce the results.
3. The evaluation script is configured to use datasets from Hugging Face by default. If you prefer to evaluate using locally downloaded dataset repositories, you can modify the CORPUS_PATH, QUERY_PATH, QRELS_PATH variables in the evaluation script to point to the local repository directory.

VisRAG-Gen

There are three settings in our generation: text-based generation, single-image-VLM-based generation and multi-image-VLM-based generation. Under single-image-VLM-based generation, there are two additional settings: page concatenation and weighted selection. For detailed information about these settings, please refer to our paper.

python scripts/generate/generate.py \
--model_name <model_name> \
--dataset_name <dataset_name> \
--rank <process_rank> \
--world_size <world_size> \
--use_positive_sample <use_positive_sample> \
--topk <number of docs retrieved for generation> \
--results_root_dir <retrieval_results_dir> \
--task_type <task_type> \
--concatenate_type <image_concatenate_type> \

Note:

1. use_positive_sample indicates whether to use retrieved documents or just the positive document for the query. topk and results_root_dir are only needed when use_positive_sample is set to 0. The results_root_dir should be organized as follows: results_root_dir/dataset_name/*.trec.
2. concatenate_type is needed only when task_type is set to page_concatenation. It specifies the type of concatenation used to combine several images.

🔧 Usage

VisRAG-Ret

Model on Hugging Face: https://huggingface.co/openbmb/VisRAG-Ret

from transformers import AutoModel, AutoTokenizer
import torch
import torch.nn.functional as F
from PIL import Image
import os

def weighted_mean_pooling(hidden, attention_mask):
    attention_mask_ = attention_mask * attention_mask.cumsum(dim=1)
    s = torch.sum(hidden * attention_mask_.unsqueeze(-1).float(), dim=1)
    d = attention_mask_.sum(dim=1, keepdim=True).float()
    reps = s / d
    return reps

@torch.no_grad()
def encode(text_or_image_list):
    
    if (isinstance(text_or_image_list[0], str)):
        inputs = {
            "text": text_or_image_list,
            'image': [None] * len(text_or_image_list),
            'tokenizer': tokenizer
        }
    else:
        inputs = {
            "text": [''] * len(text_or_image_list),
            'image': text_or_image_list,
            'tokenizer': tokenizer
        }
    outputs = model(**inputs)
    attention_mask = outputs.attention_mask
    hidden = outputs.last_hidden_state

    reps = weighted_mean_pooling(hidden, attention_mask)   
    embeddings = F.normalize(reps, p=2, dim=1).detach().cpu().numpy()
    return embeddings

model_name_or_path = "openbmb/VisRAG-Ret"
tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, trust_remote_code=True)
model = AutoModel.from_pretrained(model_name_or_path, torch_dtype=torch.bfloat16, trust_remote_code=True)
model.eval()

script_dir = os.path.dirname(os.path.realpath(__file__))
queries = ["What does a dog look like?"]
passages = [
    Image.open(os.path.join(script_dir, 'test_image/cat.jpeg')).convert('RGB'),
    Image.open(os.path.join(script_dir, 'test_image/dog.jpg')).convert('RGB'),
]

INSTRUCTION = "Represent this query for retrieving relevant documents: "
queries = [INSTRUCTION + query for query in queries]

embeddings_query = encode(queries)
embeddings_doc = encode(passages)

scores = (embeddings_query @ embeddings_doc.T)
print(scores.tolist())

VisRAG-Gen

For VisRAG-Gen, you can explore the VisRAG Pipeline on Google Colab which includes both VisRAG-Ret and VisRAG-Gen to try out this simple demonstration.

📄 License

• The code in this repo is released under the Apache-2.0 License.
• The usage of VisRAG-Ret model weights must strictly follow MiniCPM Model License.md.
• The models and weights of VisRAG-Ret are completely free for academic research. After filling out a "questionnaire" for registration, VisRAG-Ret weights are also available for free commercial use.

📧 Contact

• Shi Yu: yus21@mails.tsinghua.edu.cn
• Chaoyue Tang: tcy006@gmail.com

📈 Star History