PUMIT

This is the code repository for the paper Building Universal Foundation Models for Medical Image Analysis with Spatially Adaptive Networks (arxiv, former name: Pre-trained Universal Medical Image Transformer).

Pre-trained model weights can be found in the release page.

The code release is for reproducing results of the paper and also used for double-blinded review, which may not look nice. You may switch to the dev branch to see a cleaner version of code (but is also further developed, so it may not be consistent).

Create Environment

Mamba is recommended to manage virtual environments.

./create-env.zsh

Prepare data

Download datasets and put them under the ./datasets folder, e.g.:

datasets
├── AbdomenCT-1K
├── ACDC
├── AMOS22
├── BCV
├── BrainPTM-2021
├── BraTS2023
...

Then run pre-proecssing script: python scripts/data/process.py <dataset name>. More details can be found in the script.

Run Visual Tokenizer Pre-Training

python scripts/tokenizer/main.py -c conf/tokenizer/simple/main.yaml --data.dl_conf.train_batch_size 8 --data.dl_conf.num_workers 10 --training.benchmark true --model.quantize.mode soft --model.quantize.num_embeddings 1024 --loss.entropy_weight 1 --loss.quant_weight 0.03

Note that you may need to adjust the batch size according to the number of GPUs.

Run ViT Pre-Training

scripts/model/mim-b.zsh --data.dl_conf.train_batch_size 14 --data.dl_conf.num_workers 10 --model.tokenizer.path <tokenizer checkpoit path>

Run Downstream Tasks

Assume that the pre-trained checkpoint is placed at ./pre-trained/pumit.ckpt.

Classification

Execute scripts under scripts/downstream/medmnistv2 for training and evaluation for each model.

BTCV Segmentation

Download the BTCV data from the official challenge, and download the train/validation split file from SMIT's repository, organize the files as following:

data
├── BTCV
│   ├── smit.json
│   ├── Testing
│   └── Training

Then run fine-tuning and inference:

scripts/downstream/btcv/pumit-b.zsh --data.num_workers 10 --data.ratio 1 --trainer.logger.name pumit-b --data.train_batch_size 4
scripts/downstream/btcv/test-b.zsh --data.num_workers 10 --ckpt_path <output checkpoint path> --trainer.logger.name pumit-b

CHAOS Segmentation

First, run the pre-processing script to convert the DICOM series into NIFTI format: python scripts/downstream/chaos/preprocess.py