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https://github.com/autonomousvision/graf

Official code release for "GRAF: Generative Radiance Fields for 3D-Aware Image Synthesis"
https://github.com/autonomousvision/graf

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Official code release for "GRAF: Generative Radiance Fields for 3D-Aware Image Synthesis"

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README 

        
# GRAF











This repository contains official code for the paper

[GRAF: Generative Radiance Fields for 3D-Aware Image Synthesis](https://avg.is.tuebingen.mpg.de/publications/schwarz2020neurips).



You can find detailed usage instructions for training your own models and using pre-trained models below.



If you find our code or paper useful, please consider citing



    @inproceedings{Schwarz2020NEURIPS,

      title = {GRAF: Generative Radiance Fields for 3D-Aware Image Synthesis},

      author = {Schwarz, Katja and Liao, Yiyi and Niemeyer, Michael and Geiger, Andreas},

      booktitle = {Advances in Neural Information Processing Systems (NeurIPS)},

      year = {2020}

    }



## Installation

First you have to make sure that you have all dependencies in place.

The simplest way to do so, is to use [anaconda](https://www.anaconda.com/). 



You can create an anaconda environment called `graf` using

```

conda env create -f environment.yml

conda activate graf

```



Next, for nerf-pytorch install torchsearchsorted. Note that this requires `torch>=1.4.0` and `CUDA >= v10.1`.

You can install torchsearchsorted via

``` 

cd submodules/nerf_pytorch

pip install -r requirements.txt

cd torchsearchsorted

pip install .

cd ../../../

```



## Demo



You can now test our code via:

```

python eval.py configs/carla.yaml --pretrained --rotation_elevation

```

This script should create a folder `results/carla_128_from_pretrained/eval/` where you can find generated videos varying camera pose for the Cars dataset.



## Datasets



If you only want to generate images using our pretrained models you do not need to download the datasets.

The datasets are only needed if you want to train a model from scratch.



### Cars



To download the Cars dataset from the paper simply run

```

cd data

./download_carla.sh

cd ..

```

This creates a folder `data/carla/` downloads the images as a zip file and extracts them to `data/carla/`. 

While we do not use camera poses in this project we provide them for completeness. Your can download them by running

```

cd data

./download_carla_poses.sh

cd ..

```

This downloads the camera intrinsics (single file, equal for all images) and extrinsics corresponding to each image.  



### Faces



Download [celebA](http://mmlab.ie.cuhk.edu.hk/projects/CelebA.html).

Then replace `data/celebA` in `configs/celebA.yaml` with `*PATH/TO/CELEBA*/Img/img_align_celebA`.



Download [celebA_hq](https://github.com/tkarras/progressive_growing_of_gans).

Then replace `data/celebA_hq` in `configs/celebAHQ.yaml` with `*PATH/TO/CELEBA_HQ*`.



### Cats

Download the [CatDataset](https://www.kaggle.com/crawford/cat-dataset).

Run

```

cd data

python preprocess_cats.py PATH/TO/CATS/DATASET

cd ..

```

to preprocess the data and save it to `data/cats`.

If successful this script should print: `Preprocessed 9407 images.`



### Birds

Download [CUB-200-2011](http://www.vision.caltech.edu/visipedia/CUB-200-2011.html) and the corresponding [Segmentation Masks](https://drive.google.com/file/d/1EamOKGLoTuZdtcVYbHMWNpkn3iAVj8TP/view).

Run

```

cd data

python preprocess_cub.py PATH/TO/CUB-200-2011 PATH/TO/SEGMENTATION/MASKS

cd ..

```

to preprocess the data and save it to `data/cub`.

If successful this script should print: `Preprocessed 8444 images.`



## Usage



When you have installed all dependencies, you are ready to run our pre-trained models for 3D-aware image synthesis.



### Generate images using a pretrained model



To evaluate a pretrained model, run 

```

python eval.py CONFIG.yaml --pretrained --fid_kid --rotation_elevation --shape_appearance

```

where you replace CONFIG.yaml with one of the config files in `./configs`. 



This script should create a folder `results/EXPNAME/eval` with FID and KID scores in `fid_kid.csv`, videos for rotation and elevation in the respective folders and an interpolation for shape and appearance, `shape_appearance.png`. 



Note that some pretrained models are available for different image sizes which you can choose by setting `data:imsize` in the config file to one of the following values:

```

configs/carla.yaml: 

    data:imsize 64 or 128 or 256 or 512

configs/celebA.yaml:

    data:imsize 64 or 128

configs/celebAHQ.yaml:

    data:imsize 256 or 512

```



### Train a model from scratch



To train a 3D-aware generative model from scratch run

```

python train.py CONFIG.yaml

```

where you replace `CONFIG.yaml` with your config file.

The easiest way is to use one of the existing config files in the `./configs` directory 

which correspond to the experiments presented in the paper. 

Note that this will train the model from scratch and will not resume training for a pretrained model.



You can monitor on  the training process using [tensorboard](https://www.tensorflow.org/guide/summaries_and_tensorboard):

```

cd OUTPUT_DIR

tensorboard --logdir ./monitoring --port 6006

```

where you replace `OUTPUT_DIR` with the respective output directory.



For available training options, please take a look at `configs/default.yaml`.



### Evaluation of a new model



For evaluation of the models run

```

python eval.py CONFIG.yaml --fid_kid --rotation_elevation --shape_appearance

```

where you replace `CONFIG.yaml` with your config file.



## Multi-View Consistency Check



You can evaluate the multi-view consistency of the generated images by running a Multi-View-Stereo (MVS) algorithm on the generated images. This evaluation uses [COLMAP](https://colmap.github.io/) and make sure that you have COLMAP installed to run

```

python eval.py CONFIG.yaml --reconstruction

```

where you replace `CONFIG.yaml` with your config file. You can also evaluate our pretrained models via:

```

python eval.py configs/carla.yaml --pretrained --reconstruction

```

This script should create a folder `results/EXPNAME/eval/reconstruction/` where you can find generated multi-view images in `images/` and the corresponding 3D reconstructions in `models/`.



## Further Information



### GAN training



This repository uses Lars Mescheder's awesome framework for [GAN training](https://github.com/LMescheder/GAN_stability).



### NeRF



We base our code for the Generator on this great [Pytorch reimplementation](https://github.com/yenchenlin/nerf-pytorch) of Neural Radiance Fields.