It is typically built upon the Stable Diffusion v1.5 architecture.
The .ckpt (checkpoint) extension indicates it is a legacy format used to store the model's weights. Technical Profile pyros-bj-v1-0.ckpt
is a specific checkpoint file for Stable Diffusion , an AI image generation model. While formal "full write-ups" are rare for individual community-made models, Model Overview It is typically built upon the Stable Diffusion v1