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Projection Norm (ProjNorm)

This is the code for the ICML2022 paper:

Predicting Out-of-Distribution Error with the Projection Norm

by Yaodong Yu*, Zitong Yang*, Alexander Wei, Yi Ma, Jacob Steinhardt from UC Berkeley (*equal contribution).

Prerequisites

• Python
• Pytorch (1.10.0)
• CUDA
• numpy

How to compute ProjNorm to study model performance under distributional shift?

We use CIFAR10 (in-distribution dataset) & CIFAR10-C (out-of-distribution datasets) to demonstrate how to compute ProjNorm.

Step 0: Download OOD data

mkdir -p ./data/cifar
curl -O https://zenodo.org/record/2535967/files/CIFAR-10-C.tar
tar -xvf CIFAR-10-C.tar -C data/cifar/

Step 1: Init base model and reference model

python init_ref_model.py --arch resnet18 --train_epoch 20 --pseudo_iters 500 --lr 0.001 --batch_size 128 --seed 1

Arguments:

• arch: network architecture
• train_epoch: number of training epochs for training the base model
• pseudo_iters: number of iterations for training the reference model
• lr: learning rate
• batch_size: mini-batch size
• seed: random seed

Output:

The base model (base_model) and reference model (reference_model) are saved to './checkpoints/{}'.format(arch).

Step 2: Compute ProjNorm for in-distribution data and out-of-distribution data

python main.py --arch resnet18 --corruption snow --severity 5 --pseudo_iters 500 --lr 0.001 --batch_size 128 --seed 1

Arguments:

• arch: network architecture (apply the same architecture as in Step 1)
• corruption: corruption type
• severity: corruption severity
• pseudo_iters: number of iterations for training the reference model
• lr: learning rate
• batch_size: mini-batch size
• seed: random seed (apply the same random seed as in Step 1)

Output:

(in-distribution test error, in-distribution ProjNorm value)

(out-of-distribution test error, out-of-distribution ProjNorm value)

Reference

For more experimental and technical details, please check our paper. If you find this useful for your work, please consider citing

@InProceedings{pmlr-v162-yu22i,
  title = 	 {Predicting Out-of-Distribution Error with the Projection Norm},
  author =       {Yu, Yaodong and Yang, Zitong and Wei, Alexander and Ma, Yi and Steinhardt, Jacob},
  booktitle = 	 {Proceedings of the 39th International Conference on Machine Learning},
  pages = 	 {25721--25746},
  year = 	 {2022},
  editor = 	 {Chaudhuri, Kamalika and Jegelka, Stefanie and Song, Le and Szepesvari, Csaba and Niu, Gang and Sabato, Sivan},
  volume = 	 {162},
  series = 	 {Proceedings of Machine Learning Research},
  month = 	 {17--23 Jul},
  publisher =    {PMLR},
  pdf = 	 {https://proceedings.mlr.press/v162/yu22i/yu22i.pdf}
}