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# Long-CLIP
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This repository is the official implementation of Long-CLIP
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**Long-CLIP: Unlocking the Long-Text Capability of CLIP**\
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[Beichen Zhang](https://beichenzbc.github.io), [Pan Zhang](https://panzhang0212.github.io/), [Xiaoyi Dong](https://lightdxy.github.io/), [Yuhang Zang](https://yuhangzang.github.io/), [Jiaqi Wang](https://myownskyw7.github.io/)
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## π‘ Highlights
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- π₯ **Long Input length** Increase the maximum input length of CLIP from **77** to **248**.
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- π₯ **Strong Performace** Improve the R@5 of long-caption text-image retrieval by **20%** and traditional text-image retrieval by **6%**.
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- π₯ **Plug-in and play** Can be directly applied in **any work** that requires long-text capability.
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## π News
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π [2024/7/3] Our paper has been accepted by ***ECCV2024***.
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π [2024/7/3] We release the code of using Long-CLIP in ***SDXL***. For detailed information, you may refer to `SDXL/SDXL.md`.
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π [2024/5/21] We update the paper and checkpoints after fixing the bug in DDP and add results in Urban-1k. Special thanks to @MajorDavidZhang for finding and refining this bug in DDP! Now the fine-tuning only takes ***0.5*** hours on *8 GPUs*!
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π [2024/5/21] Urban-1k: a scaling-up version of Urban-200 dataset in the paper has been released at this [page](https://huggingface.co/datasets/BeichenZhang/Urban1k).
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π [2024/4/1] The training code is released!
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π [2024/3/25] The Inference code and models ([LongCLIP-B](https://huggingface.co/BeichenZhang/LongCLIP-B) and [LongCLIP-L](https://huggingface.co/BeichenZhang/LongCLIP-L)) are released!
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π [2024/3/25] The [paper](https://arxiv.org/abs/2403.15378) is released!
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## π¨βπ» Todo
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- [x] Training code for Long-CLIP based on OpenAI-CLIP
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- [x] Evaluation code for Long-CLIP
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- [x] evaluation code for zero-shot classification and text-image retrieval tasks.
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- [x] Usage example of Long-CLIP
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- [x] Checkpoints of Long-CLIP
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## π οΈ Usage
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### Installation
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Our model is based on [CLIP](https://github.com/openai/CLIP), please prepare environment for CLIP.
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### how to use
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Please first clone our [repo](https://github.com/beichenzbc/Long-CLIP) from github by running the following command.
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```shell
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git clone https://github.com/beichenzbc/Long-CLIP.git
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cd Long-CLIP
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```
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Then, download the checkpoints of our model [LongCLIP-B](https://huggingface.co/BeichenZhang/LongCLIP-B) and/or [LongCLIP-L](https://huggingface.co/BeichenZhang/LongCLIP-L) and place it under `./checkpoints`
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```python
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from model import longclip
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import torch
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from PIL import Image
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device = "cuda" if torch.cuda.is_available() else "cpu"
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model, preprocess = longclip.load("./checkpoints/longclip-B.pt", device=device)
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text = longclip.tokenize(["A man is crossing the street with a red car parked nearby.", "A man is driving a car in an urban scene."]).to(device)
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image = preprocess(Image.open("./img/demo.png")).unsqueeze(0).to(device)
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with torch.no_grad():
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image_features = model.encode_image(image)
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text_features = model.encode_text(text)
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logits_per_image = image_features @ text_features.T
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probs = logits_per_image.softmax(dim=-1).cpu().numpy()
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print("Label probs:", probs)
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```
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### Evaluation
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#### Zero-shot classification
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To run zero-shot classification on imagenet dataset, run the following command after preparing the data
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```shell
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cd eval/classification/imagenet
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python imagenet.py
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```
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Similarly, run the following command for cifar datset
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```shell
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cd eval/classification/cifar
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python cifar10.py #cifar10
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python cifar100.py #cifar100
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```
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#### Retrieval
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To run text-image retrieval on COCO2017 or Flickr30k, run the following command after preparing the data
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```shell
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cd eval/retrieval
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python coco.py #COCO2017
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python flickr30k.py #Flickr30k
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```
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### Traning
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Please refer to `train/train.md` for training details.
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## β Demos
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### Long-CLIP-SDXL
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<p align="center"> <a>
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<img src="./img/demo_SDXL.png" width="900" />
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</a> </p>
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### Long-caption text-image retrieval
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<p align="center"> <a>
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<img src="./img/retrieval.png" width="900" />
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</a> </p>
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### Plug-and-Play text to image generation
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<p align="center"> <a>
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<img src="./img/generation.png" width="900" />
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</a> </p>
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## Citation
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If you find our work helpful for your research, please consider giving a citation:
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```
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@article{zhang2024longclip,
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title={Long-CLIP: Unlocking the Long-Text Capability of CLIP},
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author={Beichen Zhang and Pan Zhang and Xiaoyi Dong and Yuhang Zang and Jiaqi Wang},
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journal={arXiv preprint arXiv:2403.15378},
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year={2024}
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}
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```
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