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Fix bypass dtype/device moving

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Kohaku-Blueleaf 2026-01-31 16:58:37 +08:00
parent c9b633d84f
commit 40c77373b6
1 changed files with 12 additions and 8 deletions
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20
comfy/weight_adapter/bypass.py
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@ -21,6 +21,7 @@ from typing import Optional, Union
import torch
import torch.nn as nn
import comfy.model_management
from .base import WeightAdapterBase, WeightAdapterTrainBase
from comfy.patcher_extension import PatcherInjection
@ -181,18 +182,21 @@ class BypassForwardHook:
)
return # Already injected
# Move adapter weights to module's device to avoid CPU-GPU transfer on every forward
device = None
# Move adapter weights to compute device (GPU)
# Use get_torch_device() instead of module.weight.device because
# with offloading, module weights may be on CPU while compute happens on GPU
device = comfy.model_management.get_torch_device()
# Get dtype from module weight if available
dtype = None
if hasattr(self.module, "weight") and self.module.weight is not None:
device = self.module.weight.device
dtype = self.module.weight.dtype
elif hasattr(self.module, "W_q"): # Quantized layers might use different attr
device = self.module.W_q.device
dtype = self.module.W_q.dtype
if device is not None:
self._move_adapter_weights_to_device(device, dtype)
# Only use dtype if it's a standard float type, not quantized
if dtype is not None and dtype not in (torch.float32, torch.float16, torch.bfloat16):
dtype = None
self._move_adapter_weights_to_device(device, dtype)
self.original_forward = self.module.forward
self.module.forward = self._bypass_forward