Apply Waseerstein GAN into SRGAN, a deep learning super resolution model
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README.md

SRGAN_Wasserstein

Applying Waseerstein GAN to SRGAN, a GAN based super resolution algorithm.

This repo was forked from @zsdonghao 's tensorlayer/srgan repo, based on this original repo, I changed some code to apply wasserstein loss, making the training procedure more stable, thanks @zsdonghao again, for his great reimplementation.

SRGAN Architecture

TensorFlow Implementation of "Photo-Realistic Single Image Super-Resolution Using a Generative Adversarial Network"

Wasserstein GAN

When the SRGAN was first proposed in 2016, we haven't had Wasserstein GAN(2017) yet, WGAN using wasserstein distance to measure the disturibution difference between different data set. As for the original GAN training, we don't know when to stop training the discriminator or the generator, to get a nice result. But when using the wasserstein loss, as the loss decreasing, the result will be better. So we are going to use the WGAN and we are not going to explain the math detail of WGAN here, but to give the following steps to apply WGAN.

  • Remove the sigmoid activation from the last layer of the discriminator. (model.py, line 218-219)
  • Don't take logarithm to the loss of discriminator and generator. (main.py, line 105-108)
  • Clipping the weights to some contant range [-c, c]. (main.py, line 136)
  • Don't use the optimizer like adam or momoentum which based on momentum, instead, RMSprop or SGD would be better. (main.py, line 132-133)

These above steps was given by an excellent article[4], the arthor explained the WGAN in a very straightforward way, it was written in Chinese.

Loss curve and Result

Prepare Data and Pre-trained VGG

    1. You need to download the pretrained VGG19 model in here as tutorial_vgg19.py show.
    1. You need to have the high resolution images for training.
    • In this experiment, I used images from DIV2K - bicubic downscaling x4 competition, so the hyper-paremeters in config.py (like number of epochs) are seleted basic on that dataset, if you change a larger dataset you can reduce the number of epochs.
    • If you dont want to use DIV2K dataset, you can also use Yahoo MirFlickr25k, just simply download it using train_hr_imgs = tl.files.load_flickr25k_dataset(tag=None) in main.py.
    • If you want to use your own images, you can set the path to your image folder via config.TRAIN.hr_img_path in config.py.

Run

We run this script under TensorFlow 1.4 and the TensorLayer 1.8.0+.

  • Installation
pip install tensorlayer==1.8.0
conda install tensorflow-gpu==1.3.0
pip install tensorflow-gpu==1.4.0
pip install easydict
config.TRAIN.img_path = "your_image_folder/"
  • Tenserboard logdir.

I added the tensorboard callbacks to monitor the training procedure, please change the logdir to your folder.

config.VALID.logdir = 'your_tensorboard_folder'
  • Start training.
python main.py
  • Start evaluation. (pretrained model for DIV2K) An important note: This pretrained weights is provided by the original author @zsdonghao , his final layer's conv kernel of SRGAN_g (model.py line 53) is using 1×1 kernel, but I changed this kernel to 9×9, so if you use this pretrained weights, you may get the weights unequal error. Two advice: 1)Train the whole network from scratch, you'll get the 9×9 version weights, for further training or evaluating images. 2)You can just change the SRGAN_g 's final conv kernel (model.py line 53) to (1, 1) instead of (9, 9), and change the model.py line 35 conv kernel from (9, 9) to (3, 3), so that you can use the pretrained weights.
python main.py --mode=evaluate 

What's new?

Compare with the original version, I did the following changes:

  1. Adding WGAN, as described in Wasserstein GAN chapter.
  2. Adding tensorboard, to monitor the training procedure.
  3. Modified the last conv layer of 'SRGAN_g' in model.py (line 100), changing the kernel size from (1, 1) to (9, 9), as the paper proposed.

Reference

Author

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