Python package mnistvit

A PyTorch-only implementation of a vision transformer (ViT) for training on MNIST, achieving 99.65% test accuracy with default parameters and without pre-training. The ViT architecture and learning parameters can be configured easily. Code for hyperparameter optimization is provided as well.

The code is intended to be used for learning about vision transformers. With MNIST as a simple and well understood dataset, the importance of various hyperparameters can be explored.

Requirements

The package requires Python 3.12 or greater and additionally requires the torch and torchvision packages. For hyperparameter optimization, additionally ray[tune] and optuna are required. The ViT itself requires torch only.

Installation

To install the mnistvit package, run the following command in the root directory of the repository:

pip install .

To install the package with hyperparameter optimization support:

pip install ".[tune]"

Usage

To train a model with default parameters:

python -m mnistvit.train

The script will produce a file config.json with the model configuration and file model.pt containing the trained model. Use the -h argument for a list of options.

To evaluate the test set accuracy of the model stored in model.pt with the configuration in config.json:

python -m mnistvit.predict --use-accuracy

To predict the class of the digit stored in the file sample.jpg:

python -m mnistvit.predict --image-file sample.jpg

For hyperparameter optimization with default search parameters:

python -m mnistvit.tune

A trained model is available on Hugging Face.

License

mnistvit is released under the GPLv3 license, as found in the LICENSE file.