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CDChat: A Large Multimodal Model for Remote Sensing Change Description

[Arxiv]

• Test Captions file of SYSU-CD is uploaded.
• Evaluation test questions file of SYSU-CD is uploaded
• Train/Val/Test Captions file of LEVIR-CD is uploaded
• Evaluation test questions file of LEVIR-CD is uploaded

Intruction tuning files will be available soon !!!

Overview

CDChat is a conversational assistant for RS change description task. We annotate the SYSU-CD dataset to obtain the change text and image pairs for instruction tuning of CDChat. We create change text and image pairs from the two large scale change detection datasets including SYSU-CD and LEVIR-CD.

Annotation Tool

A custom annotation tool was utilized to annotate the SYSY-CD dataset as shown below:

Installation

• Clone this repository and navigate to cdchat folder

git clone https://github.com/techmn/cdchat.git
cd cdchat

• Install Package

conda create -n cdchat python=3.10 -y
conda activate cdchat
pip install --upgrade pip  # enable PEP 660 support
pip install -e .

• Install additional packages for training cases

pip install ninja
pip install flash-attn --no-build-isolation

Train

Feature Alignment

We use the pretrained projector from LLaVA-v1.5 similar to GeoChat.

--mm_projector_type mlp2x_gelu: the two-layer MLP vision-language connector

--vision_tower openai/clip-vit-large-patch14-336: CLIP ViT-L/14 336px

Instruction Tuning

• Download the cdchat_instruct_file and the image pairs. Place the image pairs folders and cdchat_instruct_file in the same folder.
• Update the --data_path and --image_folder in the file finetune_lora.sh
• Start training !!!!

Note Our Codebase is inspired from GeoChat. Please refer to it for detailed instructions on installation and training.

Model Weights will be available soon !!!!

Evaluation

We evaluate the CDChat on the test sets of LEVIR-CD and SYSU-CD datasets. Below is the command to evaluate the CDChat on the dataset:

python cdchat/eval/batch_cdchat_vqa.py \
       --model-path /path/to/model \
       --question-file path/to/json/file \
       --answer-file path/to/output/jsonl/file \
       --image-folder path/to/image/folder/

Here are few examples of the responses from LMMs for change description task:

Citation

@misc{cdchat_2024,
      title={CDChat: A Large Multimodal Model for Remote Sensing Change Description}, 
      author={Mubashir Noman and Noor Ahsan and Muzammal Naseer and Hisham Cholakkal and Rao Muhammad Anwer and Salman Khan and Fahad Shahbaz Khan},
      year={2024},
      eprint={2409.16261},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={https://arxiv.org/abs/2409.16261}, 
}

Acknowledgements

Our codebase is inspired from the GeoChat repository. We thank them for releasing their valuable codebase.