Tip-Adapter: Training-free Adaption of CLIP for Few-shot Classification

Official implementation of 'Tip-Adapter: Training-free Adaption of CLIP for Few-shot Classification'.

The paper has been accepted by ECCV 2022.

News

• Our latest work, CaFo, is based on Tip-Adapter and accepted by CVPR 2023 🔥. Please refer here for the code.

Introduction

Tip-Adapter is a training-free adaption method for CLIP to conduct few-shot classification, which not only inherits the training-free advantage of zero-shot CLIP but also performs comparably to those training-required approaches. Tip-Adapter constructs the adapter via a key-value cache model from the few-shot training set, and updates the prior knowledge encoded in CLIP by feature retrieval. On top of that, the performance of Tip-Adapter can be further boosted to be state-of-the-art by fine-tuning the cache model for only 10x fewer epochs than existing approaches, which is both effective and efficient.

Requirements

Installation

Create a conda environment and install dependencies:

git clone https://github.com/gaopengcuhk/Tip-Adapter.git
cd Tip-Adapter

conda create -n tip_adapter python=3.7
conda activate tip_adapter

pip install -r requirements.txt

# Install the according versions of torch and torchvision
conda install pytorch torchvision cudatoolkit

Dataset

Follow DATASET.md to install ImageNet and other 10 datasets referring to CoOp.

Get Started

Configs

The running configurations can be modified in configs/dataset.yaml, including shot numbers, visual encoders, and hyperparamters.

For simplicity, we provide the hyperparamters achieving the overall best performance on 1~16 shots for a dataset, which accord with the scores reported in the paper. If respectively tuned for different shot numbers, the 1~16-shot performance can be further improved. You can edit the search_scale, search_step, init_beta and init_alpha for fine-grained tuning.

Note that the default load_cache and load_pre_feat are False for the first running, which will store the cache model and val/test features in configs/dataset/. For later running, they can be set as True for faster hyperparamters tuning.

Numerical Results

We provide Tip-Adapter's numerical results in Figure 4 and 5 of the paper at exp.log.

CLIP-Adapter's numerical results are also updated for comparison.

Running

For ImageNet dataset:

CUDA_VISIBLE_DEVICES=0 python main_imagenet.py --config configs/imagenet.yaml

For other 10 datasets:

CUDA_VISIBLE_DEVICES=0 python main.py --config configs/dataset.yaml

The fine-tuning of Tip-Adapter-F will be automatically conducted after the training-free Tip-Adapter.

Contributors

Renrui Zhang, Peng Gao

Acknowledgement

This repo benefits from CLIP, CoOp and CLIP-Adapter. Thanks for their wonderful works.

Citation

@article{zhang2021tip,
  title={Tip-Adapter: Training-free CLIP-Adapter for Better Vision-Language Modeling},
  author={Zhang, Renrui and Fang, Rongyao and Gao, Peng and Zhang, Wei and Li, Kunchang and Dai, Jifeng and Qiao, Yu and Li, Hongsheng},
  journal={arXiv preprint arXiv:2111.03930},
  year={2021}
}

Contact

If you have any question about this project, please feel free to contact zhangrenrui@pjlab.org.cn and gaopeng@pjlab.org.cn.