add configs for training unconditional/class-conditional ldms

README.md

configs/latent-diffusion/celebahq-ldm-vq-4.yaml

configs/latent-diffusion/cin-ldm-vq-f8.yaml

configs/latent-diffusion/ffhq-ldm-vq-4.yaml

configs/latent-diffusion/lsun_bedrooms-ldm-vq-4.yaml

configs/latent-diffusion/lsun_churches-ldm-kl-8.yaml

ldm/models/diffusion/ddim.py

ldm/models/diffusion/ddpm.py

ldm/modules/diffusionmodules/util.py

main.py

models/ldm/semantic_synthesis256/config.yaml

scripts/download_first_stages.sh

scripts/download_models.sh