artifacts in 4k images

[qsh-zh]

Thanks for your awesome repo. I notice with default 4k config, the generated image has lots of artifacts. Any comments?

python3 text2image_xl.py \
--pretrained_model_name_or_path stabilityai/stable-diffusion-xl-base-1.0 \
--validation_prompt "a professional photograph of an astronaut riding a horse" \
--seed 23 \
--config ./configs/sdxl_4096x4096.yaml \
--logging_dir ${your-logging-dir}

[YUANMU227]

hello，how long time is needed to a genarate 4k image using this method? and can you show more high-resolusion images made by this method?Thanks.