181 lines
6.2 KiB
Python
181 lines
6.2 KiB
Python
import comfy.supported_models_base
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import comfy.latent_formats
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import comfy.model_patcher
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import comfy.model_base
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import comfy.utils
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import comfy.conds
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import torch
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import math
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from comfy import model_management
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from .diffusers_convert import convert_state_dict
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class EXM_PixArt(comfy.supported_models_base.BASE):
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unet_config = {}
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unet_extra_config = {}
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latent_format = comfy.latent_formats.SD15
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def __init__(self, model_conf):
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self.model_target = model_conf.get("target")
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self.unet_config = model_conf.get("unet_config", {})
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self.sampling_settings = model_conf.get("sampling_settings", {})
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self.latent_format = self.latent_format()
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# UNET is handled by extension
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self.unet_config["disable_unet_model_creation"] = True
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def model_type(self, state_dict, prefix=""):
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return comfy.model_base.ModelType.EPS
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class EXM_PixArt_Model(comfy.model_base.BaseModel):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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def extra_conds(self, **kwargs):
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out = super().extra_conds(**kwargs)
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img_hw = kwargs.get("img_hw", None)
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if img_hw is not None:
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out["img_hw"] = comfy.conds.CONDRegular(torch.tensor(img_hw))
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aspect_ratio = kwargs.get("aspect_ratio", None)
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if aspect_ratio is not None:
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out["aspect_ratio"] = comfy.conds.CONDRegular(torch.tensor(aspect_ratio))
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cn_hint = kwargs.get("cn_hint", None)
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if cn_hint is not None:
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out["cn_hint"] = comfy.conds.CONDRegular(cn_hint)
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return out
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def load_pixart(model_path, model_conf=None):
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state_dict = comfy.utils.load_torch_file(model_path)
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state_dict = state_dict.get("model", state_dict)
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# prefix
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for prefix in ["model.diffusion_model.",]:
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if any(True for x in state_dict if x.startswith(prefix)):
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state_dict = {k[len(prefix):]:v for k,v in state_dict.items()}
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# diffusers
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if "adaln_single.linear.weight" in state_dict:
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state_dict = convert_state_dict(state_dict) # Diffusers
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# guess auto config
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if model_conf is None:
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model_conf = guess_pixart_config(state_dict)
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parameters = comfy.utils.calculate_parameters(state_dict)
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unet_dtype = model_management.unet_dtype(model_params=parameters)
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load_device = comfy.model_management.get_torch_device()
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offload_device = comfy.model_management.unet_offload_device()
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# ignore fp8/etc and use directly for now
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manual_cast_dtype = model_management.unet_manual_cast(unet_dtype, load_device)
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if manual_cast_dtype:
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print(f"PixArt: falling back to {manual_cast_dtype}")
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unet_dtype = manual_cast_dtype
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model_conf = EXM_PixArt(model_conf) # convert to object
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model = EXM_PixArt_Model( # same as comfy.model_base.BaseModel
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model_conf,
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model_type=comfy.model_base.ModelType.EPS,
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device=model_management.get_torch_device()
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)
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if model_conf.model_target == "PixArtMS":
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from .models.PixArtMS import PixArtMS
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model.diffusion_model = PixArtMS(**model_conf.unet_config)
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elif model_conf.model_target == "PixArt":
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from .models.PixArt import PixArt
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model.diffusion_model = PixArt(**model_conf.unet_config)
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elif model_conf.model_target == "PixArtMSSigma":
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from .models.PixArtMS import PixArtMS
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model.diffusion_model = PixArtMS(**model_conf.unet_config)
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model.latent_format = comfy.latent_formats.SDXL()
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elif model_conf.model_target == "ControlPixArtMSHalf":
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from .models.PixArtMS import PixArtMS
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from .models.pixart_controlnet import ControlPixArtMSHalf
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model.diffusion_model = PixArtMS(**model_conf.unet_config)
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model.diffusion_model = ControlPixArtMSHalf(model.diffusion_model)
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elif model_conf.model_target == "ControlPixArtHalf":
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from .models.PixArt import PixArt
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from .models.pixart_controlnet import ControlPixArtHalf
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model.diffusion_model = PixArt(**model_conf.unet_config)
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model.diffusion_model = ControlPixArtHalf(model.diffusion_model)
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else:
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raise NotImplementedError(f"Unknown model target '{model_conf.model_target}'")
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m, u = model.diffusion_model.load_state_dict(state_dict, strict=False)
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if len(m) > 0: print("Missing UNET keys", m)
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if len(u) > 0: print("Leftover UNET keys", u)
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model.diffusion_model.dtype = unet_dtype
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model.diffusion_model.eval()
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model.diffusion_model.to(unet_dtype)
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model_patcher = comfy.model_patcher.ModelPatcher(
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model,
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load_device = load_device,
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offload_device = offload_device,
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)
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return model_patcher
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def guess_pixart_config(sd):
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"""
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Guess config based on converted state dict.
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"""
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# Shared settings based on DiT_XL_2 - could be enumerated
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config = {
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"num_heads" : 16, # get from attention
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"patch_size" : 2, # final layer I guess?
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"hidden_size" : 1152, # pos_embed.shape[2]
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}
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config["depth"] = sum([key.endswith(".attn.proj.weight") for key in sd.keys()]) or 28
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try:
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# this is not present in the diffusers version for sigma?
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config["model_max_length"] = sd["y_embedder.y_embedding"].shape[0]
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except KeyError:
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# need better logic to guess this
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config["model_max_length"] = 300
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if "pos_embed" in sd:
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config["input_size"] = int(math.sqrt(sd["pos_embed"].shape[1])) * config["patch_size"]
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config["pe_interpolation"] = config["input_size"] // (512//8) # dumb guess
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target_arch = "PixArtMS"
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if config["model_max_length"] == 300:
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# Sigma
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target_arch = "PixArtMSSigma"
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config["micro_condition"] = False
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if "input_size" not in config:
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# The diffusers weights for 1K/2K are exactly the same...?
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# replace patch embed logic with HyDiT?
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print(f"PixArt: diffusers weights - 2K model will be broken, use manual loading!")
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config["input_size"] = 1024//8
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else:
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# Alpha
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if "csize_embedder.mlp.0.weight" in sd:
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# MS (microconds)
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target_arch = "PixArtMS"
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config["micro_condition"] = True
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if "input_size" not in config:
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config["input_size"] = 1024//8
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config["pe_interpolation"] = 2
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else:
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# PixArt
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target_arch = "PixArt"
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if "input_size" not in config:
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config["input_size"] = 512//8
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config["pe_interpolation"] = 1
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print("PixArt guessed config:", target_arch, config)
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return {
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"target": target_arch,
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"unet_config": config,
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"sampling_settings": {
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"beta_schedule" : "sqrt_linear",
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"linear_start" : 0.0001,
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"linear_end" : 0.02,
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"timesteps" : 1000,
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}
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}
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