blend LoRAs into existing model
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@ -3,6 +3,11 @@ from typing import List, Tuple
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from numpy import ndarray
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from onnx import ModelProto, TensorProto, helper, load, numpy_helper, save_model
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from sys import argv
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from safetensors import safe_open
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import torch
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import onnx.checker
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logger = getLogger(__name__)
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@ -100,6 +105,81 @@ def convert_diffusion_lora(part: str):
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)
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def fix_key(key: str):
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# lora_unet_up_blocks_3_attentions_2_transformer_blocks_0_attn2_to_out_0.lora_down.weight
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# lora, unet, up_block.3.attentions.2.transformer_blocks.0.attn2.to_out.0
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return key.replace(".", "_")
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def merge_lora():
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base_name = argv[1]
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lora_name = argv[2]
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base_model = load(base_name)
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lora_model = safe_open(lora_name, framework="pt")
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lora_nodes = []
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for base_node in base_model.graph.initializer:
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base_key = fix_key(base_node.name)
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for key in lora_model.keys():
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if "lora_down" in key:
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lora_key = key[:key.index("lora_down")].replace("lora_unet_", "")
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if lora_key.startswith(base_key):
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print("down for key:", base_key, lora_key)
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up_key = key.replace("lora_down", "lora_up")
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alpha_key = key[:key.index("lora_down")] + 'alpha'
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down_weight = lora_model.get_tensor(key).to(dtype=torch.float32)
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up_weight = lora_model.get_tensor(up_key).to(dtype=torch.float32)
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dim = down_weight.size()[0]
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alpha = lora_model.get(alpha_key).numpy() or dim
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scale = alpha / dim
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np_vals = numpy_helper.to_array(base_node)
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print(np_vals.shape, up_weight.shape, down_weight.shape)
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squoze = (up_weight.squeeze(3).squeeze(2) @ down_weight.squeeze(3).squeeze(2)).unsqueeze(2).unsqueeze(3)
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print(squoze.shape)
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np_vals = np_vals + (alpha * squoze.numpy())
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try:
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if len(up_weight.size()) == 2:
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squoze = (up_weight @ down_weight)
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print(squoze.shape)
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np_vals = np_vals + (squoze.numpy() * (alpha / dim))
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else:
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squoze = (up_weight.squeeze(3).squeeze(2) @ down_weight.squeeze(3).squeeze(2)).unsqueeze(2).unsqueeze(3)
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print(squoze.shape)
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np_vals = np_vals + (alpha * squoze.numpy())
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# retensor = numpy_helper.from_array(np_vals, base_node.name)
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retensor = helper.make_tensor(base_node.name, base_node.data_type, base_node.dim, np_vals, raw=True)
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print(retensor)
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# TypeError: does not support assignment
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lora_nodes.append(retensor)
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break
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except Exception as e:
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print(e)
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if retensor is None:
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print("no lora found for key", base_key)
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lora_nodes.append(base_node)
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print(len(lora_nodes), len(base_model.graph.initializer))
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del base_model.graph.initializer[:]
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base_model.graph.initializer.extend(lora_nodes)
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onnx.checker.check_model(base_model)
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if __name__ == "__main__":
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convert_diffusion_lora("unet")
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convert_diffusion_lora("text_encoder")
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