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Allow controlnets to be loaded (from ckpt) in a parallel thread with a SD model (ckpt), and speed it up slightly #4298

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Merged
patrickvonplaten merged 1 commit into from
Aug 3, 2023
+8 −2
Merged

Allow controlnets to be loaded (from ckpt) in a parallel thread with a SD model (ckpt), and speed it up slightly #4298

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10 changes: 8 additions & 2 deletions src/diffusers/pipelines/stable_diffusion/convert_from_ckpt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1070,7 +1070,9 @@ def convert_controlnet_checkpoint(
if cross_attention_dim is not None:
ctrlnet_config["cross_attention_dim"] = cross_attention_dim

controlnet = ControlNetModel(**ctrlnet_config)
ctx = init_empty_weights if is_accelerate_available() else nullcontext
with ctx():
controlnet = ControlNetModel(**ctrlnet_config)

# Some controlnet ckpt files are distributed independently from the rest of the
# model components i.e. https://huggingface.co/thibaud/controlnet-sd21/
Expand All @@ -1088,7 +1090,11 @@ def convert_controlnet_checkpoint(
skip_extract_state_dict=skip_extract_state_dict,
)

controlnet.load_state_dict(converted_ctrl_checkpoint)
if is_accelerate_available():
for param_name, param in converted_ctrl_checkpoint.items():
set_module_tensor_to_device(controlnet, param_name, "cpu", value=param)
else:
controlnet.load_state_dict(converted_ctrl_checkpoint)

return controlnet

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