Astroformer

This repository contains the official implementation of Astroformer, an ICLR Workshop 2023 paper. This model is aimed at detection tasks in the low-data regimes and achieves SoTA results on CIFAR-100, Tiny Imagenet, and science tasks like Galaxy10 DECals, and competetive performance on CIFAR-10 without any additional labelled or unlabelled data.

Accompanying paper: Astroformer: More Data Might not be all you need for Classification

Code Overview

The most important code is in astroformer.py. We trained Astroformers using the timm framework, which we copied from here.

Inside pytorch-image-models, we have made the following modifications. (Though one could look at the diff, we think it is convenient to summarize them here.)

• added timm/models/astroformer.py
• modified timm/models/__init__.py

Training

If you had a node with 8 GPUs, you could train a Astroformer 5 as follows (these are exactly the settings we used for Galaxy10 DECals as well):

sh distributed_train.sh 8 [/path/to/dataset] 
    --train-split [your_train_dir] 
    --val-split [your_val_dir] 
    --model astroformer_5
    --num-classes 10
    --img-size 256
    --in-chans 3
    --input-size 3 256 256
    --batch-size 256
    --grad-accum-steps 1
    --opt adamw
    --sched cosine
    --lr-base 2e-5
    --lr-cycle-decay 1e-2
    --lr-k-decay 1
    --warmup-lr 1e-5
    --epochs 300
    --warmup-epochs 5
    --mixup 0.8
    --smoothing 0.1
    --drop 0.1
    --save-images
    --amp
    --amp-impl apex
    --output result_ours/astroformer_5_galaxy10
    --log-wandb

You could simply use the same script with the other Astrofromer models: astroformer_0, astroformer_1, astroformer_2, astroformer_3, astroformer_4, and astroformer_5 to train those variants as well.

Main Results

CIFAR-100

Model Name	Top-1 Accuracy	FLOPs	Params
Astroformer-3	87.65	31.36	161.95
Astroformer-4	93.36	60.54	271.68
Astroformer-5	89.38	115.97	655.34

CIFAR-10

Model Name	Top-1 Accuracy	FLOPs	Params
Astroformer-3	99.12	31.36	161.75
Astroformer-4	98.93	60.54	271.54
Astroformer-5	93.23	115.97	655.04

Tiny Imagenet

Model Name	Top-1 Accuracy	FLOPs	Params
Astroformer-3	86.86	24.84	150.39
Astroformer-4	91.12	40.38	242.58
Astroformer-5	92.98	89.88	595.55

Galaxy10 DECals

Model Name	Top-1 Accuracy	FLOPs	Params
Astroformer-3	92.39	31.36	161.75
Astroformer-4	94.86	60.54	271.54
Astroformer-5	94.81	105.9	681.25

Citation

If you use this work, please cite the following paper:

BibTeX:

@article{dagli2023astroformer,
  title={Astroformer: More Data Might Not be All You Need for Classification},
  author={Dagli, Rishit},
  journal={arXiv preprint arXiv:2304.05350},
  year={2023}
}

MLA:

Dagli, Rishit. "Astroformer: More Data Might Not be All You Need for Classification." arXiv preprint arXiv:2304.05350 (2023).

Credits

The code is heavily adapted from timm.