from pathlib import Path from typing import Any import argparse import torch from refiners.foundationals.latent_diffusion import SD1UNet, SD1IPAdapter from refiners.fluxion.utils import save_to_safetensors def main() -> None: parser = argparse.ArgumentParser(description="Converts a IP-Adapter diffusers model to refiners.") parser.add_argument( "--from", type=str, dest="source_path", default="ip-adapter_sd15.bin", help="Path to the source model. (default: 'ip-adapter_sd15.bin').", ) parser.add_argument( "--to", type=str, dest="output_path", default="ip-adapter_sd15.safetensors", help="Path to save the converted model. (default: 'ip-adapter_sd15.safetensors').", ) parser.add_argument("--verbose", action="store_true", dest="verbose") parser.add_argument("--half", action="store_true", dest="half") args = parser.parse_args() if args.output_path is None: args.output_path = f"{Path(args.source_path).stem}.safetensors" weights: dict[str, Any] = torch.load(f=args.source_path, map_location="cpu") # type: ignore assert isinstance(weights, dict) assert sorted(weights.keys()) == ["image_proj", "ip_adapter"] unet = SD1UNet(in_channels=4) ip_adapter = SD1IPAdapter(target=unet) # Manual conversion to avoid any runtime dependency on IP-Adapter[1] custom classes # [1]: https://github.com/tencent-ailab/IP-Adapter state_dict: dict[str, torch.Tensor] = {} image_proj_weights = weights["image_proj"] image_proj_state_dict: dict[str, torch.Tensor] = { "Linear.weight": image_proj_weights["proj.weight"], "Linear.bias": image_proj_weights["proj.bias"], "LayerNorm.weight": image_proj_weights["norm.weight"], "LayerNorm.bias": image_proj_weights["norm.bias"], } ip_adapter.image_proj.load_state_dict(state_dict=image_proj_state_dict) for k, v in image_proj_state_dict.items(): state_dict[f"image_proj.{k}"] = v ip_adapter_weights: dict[str, torch.Tensor] = weights["ip_adapter"] assert len(ip_adapter.sub_adapters) == len(ip_adapter_weights.keys()) // 2 # Running: # # from diffusers import UNet2DConditionModel # unet = UNet2DConditionModel.from_pretrained("runwayml/stable-diffusion-v1-5", subfolder="unet") # for k in unet.attn_processors.keys(): # print(k) # # Gives: # # down_blocks.0.attentions.0.transformer_blocks.0.attn1.processor # down_blocks.0.attentions.0.transformer_blocks.0.attn2.processor # ... # down_blocks.2.attentions.1.transformer_blocks.0.attn2.processor # up_blocks.1.attentions.0.transformer_blocks.0.attn1.processor # up_blocks.1.attentions.0.transformer_blocks.0.attn2.processor # ... # up_blocks.3.attentions.2.transformer_blocks.0.attn2.processor # mid_block.attentions.0.transformer_blocks.0.attn1.processor # mid_block.attentions.0.transformer_blocks.0.attn2.processor # # With attn1=self-attention and attn2=cross-attention, and middle block in last position. So in terms of increasing # indices: # # DownBlocks -> [1, 3, 5, 7, 9, 11] # MiddleBlock -> [31] # UpBlocks -> [13, 15, 17, 19, 21, 23, 25, 27, 29] cross_attn_mapping: list[int] = [1, 3, 5, 7, 9, 11, 31, 13, 15, 17, 19, 21, 23, 25, 27, 29] for i, cross_attn in enumerate(ip_adapter.sub_adapters): cross_attn_index = cross_attn_mapping[i] k_ip = f"{cross_attn_index}.to_k_ip.weight" v_ip = f"{cross_attn_index}.to_v_ip.weight" # Ignore Wq, Wk, Wv and Proj (hence strict=False): at runtime, they will be part of the UNet original weights names = [k for k, _ in cross_attn.named_parameters()] assert len(names) == 2 cross_attn_state_dict: dict[str, Any] = { names[0]: ip_adapter_weights[k_ip], names[1]: ip_adapter_weights[v_ip], } cross_attn.load_state_dict(state_dict=cross_attn_state_dict, strict=False) for k, v in cross_attn_state_dict.items(): state_dict[f"ip_adapter.{i:03d}.{k}"] = v if args.half: state_dict = {key: value.half() for key, value in state_dict.items()} save_to_safetensors(path=args.output_path, tensors=state_dict) if __name__ == "__main__": main()