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Latent Diffusion Models
Requirements
A suitable conda environment named ldm can be created
and activated with:
conda env create -f environment.yaml
conda activate ldm
Model Zoo
Pretrained Autoencoding Models
| Model | FID vs val | PSNR | PSIM | Link | Comments |
|---|---|---|---|---|---|
| f=4, VQ (Z=8192, d=3) | 0.58 | 27.43 +/- 4.26 | 0.53 +/- 0.21 | https://ommer-lab.com/files/latent-diffusion/vq-f4.zip | |
| f=4, VQ (Z=8192, d=3) | 1.06 | 25.21 +/- 4.17 | 0.72 +/- 0.26 | https://heibox.uni-heidelberg.de/f/9c6681f64bb94338a069/?dl=1 | no attention |
| f=8, VQ (Z=16384, d=4) | 1.14 | 23.07 +/- 3.99 | 1.17 +/- 0.36 | https://ommer-lab.com/files/latent-diffusion/vq-f8.zip | |
| f=8, VQ (Z=256, d=4) | 1.49 | 22.35 +/- 3.81 | 1.26 +/- 0.37 | https://ommer-lab.com/files/latent-diffusion/vq-f8-n256.zip | |
| f=16, VQ (Z=16384, d=8) | 5.15 | 20.83 +/- 3.61 | 1.73 +/- 0.43 | https://heibox.uni-heidelberg.de/f/0e42b04e2e904890a9b6/?dl=1 | |
| f=4, KL | 0.27 | 27.53 +/- 4.54 | 0.55 +/- 0.24 | https://ommer-lab.com/files/latent-diffusion/kl-f4.zip | |
| f=8, KL | 0.90 | 24.19 +/- 4.19 | 1.02 +/- 0.35 | https://ommer-lab.com/files/latent-diffusion/kl-f8.zip | |
| f=16, KL (d=16) | 0.87 | 24.08 +/- 4.22 | 1.07 +/- 0.36 | https://ommer-lab.com/files/latent-diffusion/kl-f16.zip | |
| f=32, KL (d=64) | 2.04 | 22.27 +/- 3.93 | 1.41 +/- 0.40 | https://ommer-lab.com/files/latent-diffusion/kl-f32.zip |
Get the models
Running the following script downloads und extracts all available pretrained autoencoding models.
bash scripts/download_first_stages.sh
The first stage models can then be found in models/first_stage_models/<model_spec>
Pretrained LDMs
| Datset | Task | Model | FID | IS | Prec | Recall | Link | Comments |
|---|---|---|---|---|---|---|---|---|
| CelebA-HQ | Unconditional Image Synthesis | LDM-VQ-4 (200 DDIM steps, eta=0) | 5.11 (5.11) | 3.29 | 0.72 | 0.49 | https://ommer-lab.com/files/latent-diffusion/celeba.zip | |
| FFHQ | Unconditional Image Synthesis | LDM-VQ-4 (200 DDIM steps, eta=1) | 4.98 (4.98) | 4.50 (4.50) | 0.73 | 0.50 | https://ommer-lab.com/files/latent-diffusion/ffhq.zip | |
| LSUN-Churches | Unconditional Image Synthesis | LDM-KL-8 (400 DDIM steps, eta=0) | 4.02 (4.02) | 2.72 | 0.64 | 0.52 | https://ommer-lab.com/files/latent-diffusion/lsun_churches.zip | |
| LSUN-Bedrooms | Unconditional Image Synthesis | LDM-VQ-4 (200 DDIM steps, eta=1) | 2.95 (3.0) | 2.22 (2.23) | 0.66 | 0.48 | https://ommer-lab.com/files/latent-diffusion/lsun_bedrooms.zip | |
| ImageNet | Class-conditional Image Synthesis | LDM-VQ-8 (200 DDIM steps, eta=1) | 7.77(7.76)* /15.82** | 201.56(209.52)* /78.82** | 0.84* / 0.65** | 0.35* / 0.63** | https://ommer-lab.com/files/latent-diffusion/cin.zip | *: w/ guiding, classifier_scale 10 **: w/o guiding, scores in bracket calculated with script provided by ADM |
| Conceptual Captions | Text-conditional Image Synthesis | LDM-VQ-f4 (100 DDIM steps, eta=0) | 16.79 | 13.89 | N/A | N/A | https://ommer-lab.com/files/latent-diffusion/text2img.zip | finetuned from LAION |
| OpenImages | Super-resolution | N/A | N/A | N/A | N/A | N/A | https://ommer-lab.com/files/latent-diffusion/sr_bsr.zip | BSR image degradation |
| OpenImages | Layout-to-Image Synthesis | LDM-VQ-4 (200 DDIM steps, eta=0) | 32.02 | 15.92 | N/A | N/A | https://ommer-lab.com/files/latent-diffusion/layout2img_model.zip | |
| Landscapes (finetuned 512) | Semantic Image Synthesis | LDM-VQ-4 (100 DDIM steps, eta=1) | N/A | N/A | N/A | N/A | https://ommer-lab.com/files/latent-diffusion/semantic_synthesis.zip |
Get the models
The LDMs listed above can jointly be downloaded and extracted via
bash scripts/download_models.sh
The models can then be found in models/ldm/<model_spec>.
Sampling with unconditional models
We provide a first script for sampling from our unconditional models. Start it via
CUDA_VISIBLE_DEVICES=<GPU_ID> python scripts/sample_diffusion.py -r models/ldm/<model_spec>/model.ckpt -l <logdir> -n <\#samples> --batch_size <batch_size> -c <\#ddim steps> -e <\#eta>
Inpainting
Download the pre-trained weights
wget -O models/ldm/inpainting_big/last.ckpt https://heibox.uni-heidelberg.de/f/4d9ac7ea40c64582b7c9/?dl=1
and sample with
python scripts/inpaint.py --indir data/inpainting_examples/ --outdir outputs/inpainting_results
indir should contain images *.png and masks <image_fname>_mask.png like
the examples provided in data/inpainting_examples.
Coming Soon...
- Code for training LDMs and the corresponding compression models.
- Inference scripts for conditional LDMs for various conditioning modalities.
- In the meantime, you can play with our colab notebook https://colab.research.google.com/drive/1xqzUi2iXQXDqXBHQGP9Mqt2YrYW6cx-J?usp=sharing
- We will also release some further pretrained models.
Comments
Our codebase for the diffusion models builds heavily on OpenAI's codebase and https://github.com/lucidrains/denoising-diffusion-pytorch. Thanks for open-sourcing!
The implementation of the transformer encoder is from x-transformers by lucidrains.