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The hidden label-marginal biases of segmentation losses

Code for the paper : The hidden label-marginal biases of segmentation losses.

[arxiv]

Table of Content <!-- omit in table-of-content -->

• The hidden label-marginal biases of segmentation losses
  • Table of Content
  • Prerequisites
  • Prepare dataset
  • Quick start
    • Testing with trained model
    • Configuration system
    • Training
  • License

Prerequisites

Note : I only test the code with python 3.8 and 3.9. Environment manager like conda or virtualenv is strongly recommended.

1. Install pytorch and opencv tailored for your environment:

   torch==1.7.1
   torchvision==0.8.2
   opencv-python==4.5.1.48
   

2. Other depencencies

   pip install -r requirements.txt
   

3. Install the library

   pip install -e .
   

Prepare dataset

• Retinal Lesions :

  This dataset is freely available but you need to submit a request based on their repo. We provide the experimental data split files [link] .

  Here is the data structure to reproduce :

  ── data
  │   └── retinal-lesions-v20191227
  │       ├── classes.txt
  │       ├── images_896x896
  │       ├── lesion_segs_896x896
  │       ├── test.txt
  │       ├── train.txt
  │       └── val.txt
  

• Cityscapes :

  To download the dataset, please refer to the official site.

  Here is the recommended data structure :

  ├── Data
  │   ├── cityscapes
  │       ├── gtFine
  │       ├── leftImg8bit
  │       ├── license.txt
  │       └── README
  

  By convention, **labelTrainIds.png are used for cityscapes training and validation. We use the scripts in mmsegmentation to generate **labelTrainIds.png.

• 3D medical imaging datasets (e.g., Livers & Tumors, Pancreas & Tumors, AMOS): please refer to nnUNetv1.

Quick start

Testing with trained model

We provide two best models we currently trained on Retinal Lesions and Cityscapes for quick testing.

• Retinal Lesions: model

  python tools/test_net.py --config-file ./configs/retinal-lesions/unet_bce-l1_896x896.yaml \\
      TEST.CHECKPOINT_PATH ./trained/retinal-lesions_r50unet_896x896_bce-l1.pth (OR_YOUR_LOCAL_PATH)
  

• Cityscapes : model

  python tools/test_net.py --config-file ./configs/cityscapes/r50fpn_512x1024_ce_l1.yaml \\
      TEST.CHECKPOINT_PATH ./trained/cityscapes_r50fpn_512x1024_ce-l1.pth TEST.SPLIT val
  

• AMOS : model. Need to be testing with nnUNetv1.

Configuration system

We use YACS to define and manage all the configurations. In a nutshell, you typically create a YAML configuration file for each experiment.

All configurable options are defined in defaults.py with default values. Note that each YAML configuration file only overrides the options that are chaning in that experiment. You can also overriede options from the command line using a list of fully-qualified key, value pairs.

Training

The configurations may seem confusing at first. You can play quickly with the provided configuration files.

• Retinal Lesions

python tools/train_net.py --config-file ./configs/retinal-lesions/unet_bce-l1_896x896.yaml

• Cityscapes

python tools/train_net.py --config-file ./configs/cityscapes/r50fpn_512x1024_ce_l1.yaml

• 3D medical imaging datasets (e.g., Livers & Tumors, Pancreas & Tumors, AMOS): plug the implemented losses under losses_nnunet into nnUNetv1.

License

This work is licensed under MIT License. See LICENSE for details.

If you find this paper/code useful for your research, please consider citing :

@misc{liu2021hidden, title={The hidden label-marginal biases of segmentation losses}, author={Bingyuan Liu and Jose Dolz and Adrian Galdran and Riadh Kobbi and Ismail Ben Ayed}, year={2021}, eprint={2104.08717}, archivePrefix={arXiv}, primaryClass={cs.CV} }