diffusers safetensors stable-diffusion stable-diffusion-diffusers text-to-image simpletuner full base_model:terminusresearch/pixart-900m-1024-ft-v0.5 base_model:finetune:terminusresearch/pixart-900m-1024-ft-v0.5 license:creativeml-openrail-m diffusers:PixArtSigmaPipeline region:us