WIP: Unofficial implementation of diffusion autoencoders, using pytorch (https://diff-ae.github.io/)
Special thanks for https://github.com/lucidrains/denoising-diffusion-pytorch and https://github.com/openai/guided-diffusion
python scripts/sample_diffusion_autoencoder.py \ --checkpoint-path=$PATH_TO_PREVIOUSLY_DOWNLOADED_CHECKPOINT \ --config-path =./config/ffhq_64_openai.yml \
import torch
from model.diffusion import GaussianDiffusion
from model.openai.openai import UnetModel, EncoderUNetModel
from model.latent_encoder import LateEncoder
model = Unet(
image_size=[28,28],
in_channels=1,
out_channels=1,
model_channels=32,
num_res_blocks=2,
channel_mult=[1, 2],
attention_resolutions=[],
z_dim=256,
)
# almost same as the model. z_dim MUST be equals.
encoder = EncoderUNetModel(
image_size=[28,28],
in_channels=1,
model_channels=32,
num_res_blocks=2,
channel_mult=[1, 2],
attention_resolutions=[],
pool= 'spatial_v2',
z_dim=256,
)
diffusion = AutoEncoderGaussianDiffusion(
model,
image_size = 28,
timesteps = 1000, # number of steps
loss_type = 'l1', # L1 or L2
latent_encoder = encoder,
)
training_images = torch.randn(8, 1, 28, 28)
loss = diffusion(training_images)
loss.backward()
# after a lot of training
image = torch.randn(3, 1, 28, 28)
result, latent = diffusion.p_sample_loop((1, model.in_channels, *model.size), image)
result.shape # (3, 1, 28, 28)
latent.shape # (3, 128)