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Can Neural Nets Learn the Same Model Twice? Investigating Reproducibility and Double Descent from the Decision Boundary Perspective

To appear in CVPR 2022 (Oral). Check out the arxiv version here

alt text

Requirements

We recommend using anaconda or miniconda for python. Our code has been tested with python=3.8 on linux.

Create a conda environment from the yml file and activate it.

conda env create -f environment.yml
conda activate dbviz_env

Make sure the following requirements are met

  • torch>=1.8.1
  • torchvision>=0.9.1

We used wandb to log most of the outputs.

conda install -c conda-forge wandb

Training the model and plotting the decision boundary

We provide wide variety of models, please see models folder to see the exhasutive list. Train the model with following command.

python main.py --net <model_name> --set_seed <init_seed> --save_net <model_save_path> --imgs 500,5000,1600 --resolution 500 --active_log --epochs <number_epochs> --lr <suitable_learningrate>

Reproducibility experiments

Once you have a saved model, we save prediction arrays for this model by running the following command:

python save_preds.py --load_net /path/to/your/saved/models --epochs 500 --resolution 50

Here, epochs is a stand-in for number of runs, and resolution determines the grid resolution for sampling.

Then, we calculate the reproducibility matrix by running the following command:

python calculate_iou.py --load_net /path/to/your/saved/models

These two scripts also contain more information about the structure of saved models that is needed.

To recreate the plots from the paper, first train each architecture atleast 3 times with different initilaization seed (like 0,1,2). Then run the following bash file.

bash script_plots.sh

Double Descent experiments

To reproduce double descent experiments, please refer to the README file in the double-descent folder.

Acknowledgements

We would like to thank the following public repos from which we borrowed model training utilites.

License

This repository is released under the Apache 2.0 license as found in the LICENSE file.

Cite us

@article{somepalli2022can,
  title={Can Neural Nets Learn the Same Model Twice? Investigating Reproducibility and Double Descent from the Decision Boundary Perspective},
  author={Somepalli, Gowthami and Fowl, Liam and Bansal, Arpit and Yeh-Chiang, Ping and Dar, Yehuda and Baraniuk, Richard and Goldblum, Micah and Goldstein, Tom},
  journal={arXiv preprint arXiv:2203.08124},
  year={2022}
}