TransDeepLab

The official code for "TransDeepLab: Convolution-Free Transformer-based DeepLab v3+ for Medical Image Segmentation".

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Updates

• July 19, 2022: Initial release.
• July 4, 2022: Submitted to MICCAI PRIME2022 [Under Review] [Accepted].

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Setting up and Training

• We use the code base from the Swin-Unet GitHub repo as our starting point.

• In order to run the code and experiments, you need to first install the dependencies and then download and move the data to the right place.

  • For the Synapse dataset, we used the data provided by TransUnet's authors.
  • For ISIC 2017-18 datasets, we used the ISIC Challenge datasets link.
  • For the PH² dataset, we used this link.

• We have put the required instructions for doing the above steps in the ./setup.sh file in the repo for your convenience. cd to this repo directory and then run it to install dependencies and download and move data to the right dir.

• Download Swin-T pre-trained weights from this link and put it into the folder pretrained_ckpt/.

• Then you need to run the train.py file with the appropriate arguments to run your experiment. let's just see an example for now for the Synapse dataset:

python train.py --config_file 'swin_224_7_{# of SSPP}level' --dataset Synapse --root_path './data' --max_epochs 200 --output_dir '.'  --img_size 224 --base_lr 0.05 --batch_size 24

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Config files and hyperparameters

• All the hyperparameters related to building different models are in separate files in ./model/configs directory.

• For each experiment, you need to make your desired config_name.py file and put it in the model/configs dir and then enter the file name (without .py suffix) in the python train.py command you saw in the previous section after --config_file arg.

• For the rest of the hyperparameters like batch_size, max_epochs, base_lr, ... look at the Swin-Unet or the code here to see what you can change and how to do so.

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Test

• The model can be tested with the following command using test.py file. During training, model checkpoints will be saved to disk with the following format: output_dir/{config_file_name}_epoch_{epoch_num}.pth.

• It takes the checkpoint (model weight file) name as an input argument and loads the appropriate config file from the configs dir.

• Other arguments and flags can be given to the test.py file if some settings need to be modified but --ckpt_path and --config_file are the only required arguments.

• Trained weights for our best-reported results in the paper for the Synapse dataset are easily accessible from this link, where you could download it as a sole folder via gdown or setting specific links listed under the below table:

Model setting name	Pre-trained weights	--config_file name
SSPP Level 1	link	swin_224_7_1level
SSPP Level 2	link	swin_224_7_2level
SSPP Level 3	link	swin_224_7_3level
SSPP Level 4	link	swin_224_7_4level

• ❗ Remember to put these weights in a specific folder that you are going to address them with test.py via --ckpt_path flag.

• Comparison results table on the Synapse dataset:

Methods	DSC ↑	HD ↓	Aorta	Gallbladder	Kidney(L)	Kidney(R)	Liver	Pancreas	Spleen	Stomach
V-Net	68.81	-	75.34	51.87	77.10	80.75	87.84	40.05	80.56	56.98
R50 U-Net	74.68	36.87	87.74	63.66	80.60	78.19	93.74	56.90	85.87	74.16
U-Net	76.85	39.70	89.07	69.72	77.77	68.60	93.43	53.98	86.67	75.58
R50 Att-UNet	75.57	36.97	55.92	63.91	79.20	72.71	93.56	49.37	87.19	74.95
Att-UNet	77.77	36.02	89.55	68.88	77.98	71.11	93.57	58.04	87.30	75.75
R50 ViT	71.29	32.87	73.73	55.13	75.80	72.20	91.51	45.99	81.99	73.95
TransUnet	77.48	31.69	87.23	63.13	81.87	77.02	94.08	55.86	85.08	75.62
SwinUnet	79.13	21.55	85.47	66.53	83.28	79.61	94.29	56.58	90.66	76.60
DeepLabv3+ (CNN)	77.63	39.95	88.04	66.51	82.76	74.21	91.23	58.32	87.43	73.53
TransDeepLab	80.16	21.25	86.04	69.16	84.08	79.88	93.53	61.19	89.00	78.40

• Impact of modifying modules inside the proposed method:

Setting	DSC ↑	HD ↓	Aorta	Gallbladder	Kidney(L)	Kidney(R)	Liver	Pancreas	Spleen	Stomach
CNN as Encoder	75.89	28.87	85.03	65.17	80.18	76.38	90.49	57.29	85.68	69.93
Basic Scale Fusion	79.16	22.14	85.44	68.05	82.77	80.79	93.80	58.74	87.78	75.96
SSPP Level 1	79.01	26.63	85.61	68.47	82.43	78.02	94.19	58.52	88.34	76.46
SSPP Level 2	80.16	21.25	86.04	69.16	84.08	79.88	93.53	61.19	89.00	78.40
SSPP Level 3	79.87	18.93	86.34	66.41	84.13	82.40	93.73	59.28	89.66	76.99
SSPP Level 4	79.85	25.69	85.64	69.36	82.93	81.25	93.09	63.18	87.80	75.56

• A look at the number of parameters:

Model	# Encoder Parameters	# ASPP Parameters	# Decoder Parameters	# Total
Original DeepLab (Xception-512)	37.86	15.53	1.30	54.70
Original Swin-Unet (224-7)	-	-	-	27.17
Our TransDeepLab (swin_224_7_1level)	12.15	1.83	3.49	17.48
Our TransDeepLab (swin_224_7_2level)	12.15	5.49	3.49	21.14
Our TransDeepLab (swin_224_7_3level)	12.15	9.20	3.49	24.85
Our TransDeepLab (swin_224_7_4level)	12.15	12.96	3.49	28.61

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Visualization

• Results on the Synapse dataset:

Image	Ground Truth	Prediction

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References

• TransUNet
• Swin-Unet

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Citation

@article{azad2022transdeeplab,
  title={TransDeepLab: Convolution-Free Transformer-based DeepLab v3+ for Medical Image Segmentation},
  author={Azad, Reza and Heidari, Moein and Shariatnia, Moein and Aghdam, Ehsan Khodapanah and Karimijafarbigloo, Sanaz and Adeli, Ehsan and Merhof, Dorit},
  journal={arXiv preprint arXiv:2208.00713},
  year={2022}
}