Test-Time Model Adaptation with Only Forward Passes

This is the official project repository for Test-Time Model Adaptation with Only Forward Passes (ICML 2024) by Shuaicheng Niu, Chunyan Miao, Guohao Chen, Pengcheng Wu, Peilin Zhao

• 1️⃣ FOA conducts model learning at test time to adapt a pre-trained model to test data that has distributional shifts ☀️ 🌧 ❄️, such as corruptions, simulation-to-real discrepancies, and other differences between training and testing data.
• 2️⃣ FOA performs adaptation on both input and output levels, which avoids modification to model parameters and adapts in a backpropagation-free manner. Consequently, FOA offers the following benefits:
  1. reduces memory usage significantly, e.g., 5,165MB (Tent) $\rightarrow$ 832MB when using ViTBase and a BS of 64.
  2. compatible with quantized models, which typically do not support backpropagation.
  3. compatible with models on specialized chips, where parameters are hardcoded and non-modifiable.

Dependencies Installation:

pip install cma
pip install torch==2.1.0 torchvision==0.16.0 torchaudio==2.1.0 --index-url https://download.pytorch.org/whl/cu118
pip install timm==0.9.10

Data Preparation:

This repository contains code for evaluation on ImageNet-C/R/V2/Sketch with VitBase. But feel free to use your own data and models! Please check here 🔗 for a detailed guide on preparing these datasets.

Usage

from tta_library.foa import FOA
from models.vpt import PromptViT

model = TODO_model()
model = PromptViT(model, 3)

adapt_model = FOA(model, args.fitness_lambda)
train_loader = TODO_loader()
adapt_model.obtain_origin_stat(train_loader)

outputs = adapt_model(inputs)

Example: ImageNet-C Experiments

Usage (full precision experiments):

python3 main.py \
    --data path/to/imagenet \
    --data_v2 path/to/imagenet-v2 \
    --data_sketch path/to/imagenet-sketch \
    --data_corruption path/to/imagenet-c \
    --data_rendition path/to/imagenet-r \
    --algorithm [tent/foa/lame/t3a/sar/cotta] \ 

For experiments with quantized ViT, simply add

--quant

in the above command.

Experimental Results

The Table below demonstrates the result of both full precision and quantized ViTs. The reported average accuracy (%, $\uparrow$) / ECE (%, $\downarrow$) is averaged over 15 different corruption types in ImageNet-C (severity level 5).

	ViT (full precision, 32-bit)	ViT (8-bit)	ViT (6-bit)
NoAdapt	55.5 / 10.5	54.1 / 10.8	47.7 / 9.9
LAME	54.1 / 11.0	52.5 / 12.4	45.8 / 10.4
T3A	56.9 / 26.8	55.1 / 25.9	45.4 / 30.1
Tent	59.6 / 18.5	-	-
CoTTA	61.7 / 6.5	-	-
SAR	62.7 / 7.0	-	-
FOA	66.3 / 3.2	63.5 / 3.8	55.8 / 5.5

Please see our PAPER 🔗 for more detailed results.

Correspondence

Please contact Shuaicheng Niu by [shuaicheng.niu at ntu.edu.sg] and Guohao Chen by [chenguohao987 at gmail.com] if you have any questions. 📬

Citation

If our FOA method or the setting of test-time adaptation with only forward passes is helpful in your research, please consider citing our paper:

@inproceedings{niu2024test,
  title={Test-Time Model Adaptation with Only Forward Passes},
  author={Shuaicheng Niu, Chunyan Miao, Guohao Chen, Pengcheng Wu, Peilin Zhao},
  booktitle = {The International Conference on Machine Learning},
  year = {2024}
}

Acknowledgment

The code is inspired by EATA 🔗 and VPT 🔗