DDPM

A Simple implementation of DDPM model in PyTorch.

It's just for fun, the Unet model does not include attention, normalization, etc.

Classifier Guidence DDPM

ref: Diffusion Models Beat GANs on Image Synthesis (https://arxiv.org/abs/2105.05233)

• generate "7"
  • 
• generate "2"
  • 

Traning

Before training, please set up the config.ini file:

[unet]
batch_size = 256
time_emb_dim = 128
device = cuda
epoch_num = 500
learning_rate = 1e-4

[ddpm]
iteration = 500

To start training, run:

$ python train.py

Sampling

To generate 16 pictures, run the following command:

The pictures will be output to the ./output directory.

$ python sample 16                  # unconditional
$ python sample 16 7                # condiditional, want to generate "7" pictures