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  - pytorch
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  - diffusers
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  - unconditional-image-generation
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- ---
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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  - pytorch
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  - diffusers
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  - unconditional-image-generation
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+ ---
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+
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+ # Denoising Diffusion Probabilistic Models (DDPM)
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+ **Paper**: [Denoising Diffusion Probabilistic Models](https://arxiv.org/abs/2006.11239)
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+ **Authors**: Jonathan Ho, Ajay Jain, Pieter Abbeel
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+ **Abstract**:
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+ *We present high quality image synthesis results using diffusion probabilistic models, a class of latent variable models inspired by considerations from nonequilibrium thermodynamics. Our best results are obtained by training on a weighted variational bound designed according to a novel connection between diffusion probabilistic models and denoising score matching with Langevin dynamics, and our models naturally admit a progressive lossy decompression scheme that can be interpreted as a generalization of autoregressive decoding. On the unconditional CIFAR10 dataset, we obtain an Inception score of 9.46 and a state-of-the-art FID score of 3.17. On 256x256 LSUN, we obtain sample quality similar to ProgressiveGAN.*
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+ ## Inference
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+ **DDPM** models can use *discrete noise schedulers* such as:
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+ - [scheduling_ddpm](https://github.com/huggingface/diffusers/blob/main/src/diffusers/schedulers/scheduling_ddpm.py)
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+ - [scheduling_ddim](https://github.com/huggingface/diffusers/blob/main/src/diffusers/schedulers/scheduling_ddim.py)
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+ - [scheduling_pndm](https://github.com/huggingface/diffusers/blob/main/src/diffusers/schedulers/scheduling_pndm.py)
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+ for inference. Note that while the *ddpm* scheduler yields the highest quality, it also takes the longest.
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+ For a good trade-off between quality and inference speed you might want to consider the *ddim* or *pndm* schedulers instead.
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+ See the following code:
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+ ```python
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+ # !pip install diffusers
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+ from diffusers import DDPMPipeline, DDIMPipeline, PNDMPipeline
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+ model_id = "google/ddpm-cifar10-32"
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+
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+ # load model and scheduler
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+ ddpm = DDPMPipeline.from_pretrained(model_id) # you can replace DDPMPipeline with DDIMPipeline or PNDMPipeline for faster inference
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+ # run pipeline in inference (sample random noise and denoise)
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+ image = ddpm()["sample"]
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+
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+ # save image
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+ image[0].save("ddpm_generated_image.png")
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+ ```
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+ For more in-detail information, please have a look at the [official inference example](_) # <- TODO(PVP) add link
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+
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+ ## Training
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+ If you want to train your own model, please have a look at the [official training example]( ) # <- TODO(PVP) add link
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+
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+ ## Samples
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+ 1. ![sample_1](https://huggingface.co/google/ddpm-church-256/resolve/main/generated_image_0.png)
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+ 2. ![sample_2](https://huggingface.co/google/ddpm-church-256/resolve/main/generated_image_1.png)
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+ 3. ![sample_3](https://huggingface.co/google/ddpm-church-256/resolve/main/generated_image_2.png)
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+ 4. ![sample_4](https://huggingface.co/google/ddpm-church-256/resolve/main/generated_image_3.png)