img2ImgGAN

Implementation of the paper : Toward Multimodal Image-to-Image Translation

Link to the paper : arXiv:1711.11586
PyTorch implementation: Link
Summary of the paper: Gist

Results

Result First column represents input, second column the ground truth. The next is the image generated from cLR-GAN and the last column represents the image generated from cVAE-GAN. Results were obtained from validation dataset.

Model Architecture Visualization

Network

Fig 1: Structure of BicycleGAN. (Image taken from the paper)

Tensorboard visualization of the entire network

cVAE-GAN Network

Dependencies

tensorflow (1.4.0)
numpy (1.13.3)
scikit-image (0.13.1)
scipy (1.0.0)

To install the above dependencies, run:

$ sudo pip install -r requirements.txt

Structure

 -img2imgGAN/
            -nnet
            -utils
            -data/
                  -edges2handbags
                  -edges2shoes
                  -facades
                  -maps

Setup

Download the datasets from the following links
To generate numpy files for the datasets,
```
$ python main.py --create <dataset_name>
```
This creates train.npy and val.npy in the corresponding dataset directory. This generates very huge files. As an alternate, the next step attempts to read images at run-time during training
Alternate to the above step, you could read the images in real time during training. To do this, you should create files containing paths to the images. This can be done by running the following script in the root of this repo.
```
$ bash setup_dataset.sh
```

Usage

Generating graph:

To visualize the connections between the graph nodes, we can generate the graph using the flag archi. This would be useful to assert the connections are correct. This generates the graph for bicycleGAN
```
$ python main.py --archi
```
To generate the model graph for cvae-gan,
```
$ python main.py --model cvae-gan --archi
```
Possible models are: cvae-gan, clr-gan, bicycle (default)

To visualize the graph on tensorboard, run the following command:
```
$ tensorboard --logdir=logs/summary/Run_1 --host=127.0.0.1
```
Replace Run_1 with the latest directory name
Complete list of options:
```
$ python main.py --help
```

Training the network

To train model (say cvae-gan) on dataset (say facades) from scratch,
```
$ python main.py --train --model cvae-gan --dataset facades
```
The above command by default trains the model in which images from distribution of domain B are generated conditioned on the images from the distribution of domain A. To switch the direction,
```
$ python main.py --train --model cvae-gan --dataset facades --direction b2a
```
To resume the training from a checkpoint,
```
$ python main.py --resume <path_to_checkpoint> --model cvae-gan
```

Testing the network
- Download the checkpoint file from here and place the checkpoint files in the ckpt directory
To test the model from the given trained models, by default the model generates 5 different images (by sampling 5 different noise samples)
```
$ ./test.sh <dataset_name> <test_image_path>
```
To generate multiple output samples,
```
$ ./test.sh <dataset_name> <test_image_path> < # of samples>
```
Try it with some of the test samples present in the directory imgs/test