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SemGAN

Tensorflow version implementation of SemGAN

This repository contains the TensorFlow code of Semantics-aware GAN(SemGAN) method for performing semantic-aware domain adaptation tasks. The architecture of SemGAN network is:

Architecture_SemGAN

Getting started with the code

Prepare for the datasets

For training sim2real domain adaptation SemGAN model, the selected datasets for training are: GTA dataset, Cityscapes dataset. The alternative datasets for testing are: Virtual KITTI dataset, KITTI dataset and GIBSON.

  • Download the GTA images and labels:
$ wget https://download.visinf.tu-darmstadt.de/data/from_games/data/01_images.zip
$ unzip 01_images.zip
$ wget https://download.visinf.tu-darmstadt.de/data/from_games/data/01_labels.zip
$ unzip 01_labels.zip

Downloading the Cityscapes dataset requires registration on the website: https://www.cityscapes-dataset.com/dataset-overview/. After downloading the datasets(images and labels), put the images and the corresponding labels from each domain in four different folders, and then put these four folders in one folder named GTA2Cityscapes.

  • Create the csv file as input to the data loader:
  1. Edit the semgan_datasets.py file. For example: if the downloaded datasets contain 666 GTA images, 666 GTA labels, 888 Cityscapes images and 888 Cityscapes labels, then the file can be formulated as following:
DATASET_TO_SIZES = {
  'GTA2Cityscapes_train': 888,
  'GTA2Cityscapes_test': 888,
}

"""The image types of each dataset. Currently only supports .jpg or .png"""
DATASET_TO_IMAGETYPE = {
  'GTA2Cityscapes_train': '.jpg',
  'GTA2Cityscapes_test': '.jpg',
}

"""The path to the output csv file."""
PATH_TO_CSV = {
  'GTA2Cityscapes_train': './input/GTA2Cityscapes/GTA2Cityscapes_train.csv',
  'GTA2Cityscapes_test': './input/GTA2Cityscapes/GTA2Cityscapes_test.csv',
}
  1. Run create_semgan_datasets.py
python -m create_semgan_datasets --image_path_a='./input/GTA2Cityscapes/GTA_imgs' --image_path_b='./input/GTA2Cityscapes/Cityscapes_imgs' --label_path_a='./input/GTA2Cityscapes/GTA_labels' --label_path_b='./input/GTA2Cityscapes/Cityscapes_labels'  --dataset_name="GTA2Cityscapes_train" --do_shuffle=0

This will create a .csv file from the path of the dataset folders. This .csv file is the input of the data_loader.py file.

Training

  • Create the configuration file. The configuration file contains basic information for training/testing. An example of the configuration file could be found at configs/exp_01.json. Edit the critical items for training and testing the model.
  "pool_size": 50,
  "base_lr":0.0002,
  "max_step": 200,
  "dataset_name": "GTA2Cityscapes_train",
  "do_flipping": 1,
  "_LAMBDA_B": 10,
  "_LAMBDA_OBJ_A": 0,
  "_LAMBDA_OBJ_B": 0,
  "_LAMBDA_SEM_A": 10,
  "_LAMBDA_SEM_B": 10
  • Start training:
 python main.py  --to_train=1 --log_dir=./output/SemGAN/exp_01 --config_filename=./configs/exp_01.json