219 lines
8.6 KiB
Python
219 lines
8.6 KiB
Python
from argparse import ArgumentParser
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from logging import getLogger
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from os import path
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from typing import Dict, Literal
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import numpy as np
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import torch
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from onnx import TensorProto, load, numpy_helper
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from onnx.checker import check_model
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from onnx.external_data_helper import (
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convert_model_to_external_data,
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write_external_data_tensors,
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)
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from safetensors.torch import load_file
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from onnx_web.convert.utils import ConversionContext
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logger = getLogger(__name__)
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###
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# everything in this file is still super experimental and may not produce valid ONNX models
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###
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def fix_initializer_name(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 fix_node_name(key: str):
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fixed_name = fix_initializer_name(key.replace("/", "_"))
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if fixed_name[0] == "_":
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return fixed_name[1:]
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else:
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return fixed_name
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def merge_lora(
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base_name: str,
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lora_names: str,
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dest_path: str,
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dest_type: Literal["text_encoder", "unet"],
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lora_weights: "np.NDArray[np.float64]" = None,
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):
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base_model = load(base_name)
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lora_models = [load_file(name) for name in lora_names]
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lora_count = len(lora_models)
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lora_weights = lora_weights or (np.ones((lora_count)) / lora_count)
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if dest_type == "text_encoder":
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lora_prefix = "lora_te_"
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else:
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lora_prefix = f"lora_{dest_type}_"
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blended: Dict[str, np.ndarray] = {}
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for lora_name, lora_model, lora_weight in zip(lora_names, lora_models, lora_weights):
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logger.info("blending LoRA from %s with weight of %s", lora_name, lora_weight)
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for key in lora_model.keys():
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if ".lora_down" in key and lora_prefix in key:
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base_key = key[: key.index(".lora_down")].replace(
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lora_prefix, ""
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)
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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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logger.info("blending weights for keys: %s, %s, %s", key, up_key, alpha_key)
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down_weight = lora_model[key].to(dtype=torch.float32)
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up_weight = lora_model[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, dim).to(torch.float32).numpy()
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try:
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if len(up_weight.size()) == 2:
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# blend for nn.Linear
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logger.info("blending weights for Linear node: %s, %s, %s", down_weight.shape, up_weight.shape, alpha)
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weights = up_weight @ down_weight
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np_weights = (weights.numpy() * (alpha / dim))
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elif len(up_weight.size()) == 4 and up_weight.shape[-2:] == (1, 1):
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# blend for nn.Conv2d 1x1
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logger.info("blending weights for Conv node: %s, %s, %s", down_weight.shape, up_weight.shape, alpha)
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weights = (
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(
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up_weight.squeeze(3).squeeze(2)
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@ down_weight.squeeze(3).squeeze(2)
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)
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.unsqueeze(2)
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.unsqueeze(3)
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)
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np_weights = (weights.numpy() * (alpha / dim))
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else:
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# TODO: add support for Conv2d 3x3
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logger.warning("unknown LoRA node type at %s: %s", base_key, up_weight.shape[-2:])
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continue
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np_weights *= lora_weight
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if base_key in blended:
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blended[base_key] += np_weights
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else:
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blended[base_key] = np_weights
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except Exception:
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logger.exception(
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"error blending weights for key %s", base_key
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)
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logger.info(
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"updating %s of %s initializers: %s",
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len(blended.keys()),
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len(base_model.graph.initializer),
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list(blended.keys())
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)
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fixed_initializer_names = [
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fix_initializer_name(node.name) for node in base_model.graph.initializer
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]
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# logger.info("fixed initializer names: %s", fixed_initializer_names)
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fixed_node_names = [
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fix_node_name(node.name) for node in base_model.graph.node
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]
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# logger.info("fixed node names: %s", fixed_node_names)
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for base_key, weights in blended.items():
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conv_key = base_key + "_Conv"
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matmul_key = base_key + "_MatMul"
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logger.info("key %s has conv: %s, matmul: %s", base_key, conv_key in fixed_node_names, matmul_key in fixed_node_names)
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if conv_key in fixed_node_names:
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conv_idx = fixed_node_names.index(conv_key)
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conv_node = base_model.graph.node[conv_idx]
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logger.info("found conv node: %s", conv_node.name)
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# find weight initializer
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logger.info("conv inputs: %s", conv_node.input)
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weight_name = [n for n in conv_node.input if ".weight" in n][0]
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weight_name = fix_initializer_name(weight_name)
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weight_idx = fixed_initializer_names.index(weight_name)
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weight_node = base_model.graph.initializer[weight_idx]
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logger.info("found weight initializer: %s", weight_node.name)
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# blending
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base_weights = numpy_helper.to_array(weight_node)
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logger.info("found blended weights for conv: %s, %s", weights.shape, base_weights.shape)
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blended = base_weights.squeeze((3, 2)) + weights.squeeze((3, 2))
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blended = np.expand_dims(blended, (2, 3))
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logger.info("blended weight shape: %s", blended.shape)
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# replace the original initializer
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updated_node = numpy_helper.from_array(blended, weight_node.name)
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del base_model.graph.initializer[weight_idx]
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base_model.graph.initializer.insert(weight_idx, updated_node)
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elif matmul_key in fixed_node_names:
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weight_idx = fixed_node_names.index(matmul_key)
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weight_node = base_model.graph.node[weight_idx]
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logger.info("found matmul node: %s", weight_node.name)
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# find the MatMul initializer
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logger.info("matmul inputs: %s", weight_node.input)
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matmul_name = [n for n in weight_node.input if "MatMul" in n][0]
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matmul_idx = fixed_initializer_names.index(matmul_name)
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matmul_node = base_model.graph.initializer[matmul_idx]
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logger.info("found matmul initializer: %s", matmul_node.name)
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# blending
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base_weights = numpy_helper.to_array(matmul_node)
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logger.info("found blended weights for matmul: %s, %s", weights.shape, base_weights.shape)
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blended = base_weights + weights.transpose()
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logger.info("blended weight shape: %s", blended.shape)
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# replace the original initializer
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updated_node = numpy_helper.from_array(blended, matmul_node.name)
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del base_model.graph.initializer[matmul_idx]
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base_model.graph.initializer.insert(matmul_idx, updated_node)
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else:
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logger.info("could not find any nodes for %s", base_key)
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logger.info("node counts: %s -> %s, %s -> %s", len(fixed_initializer_names), len(base_model.graph.initializer), len(fixed_node_names), len(base_model.graph.node))
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# save it back to disk
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# TODO: save to memory instead
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convert_model_to_external_data(
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base_model,
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all_tensors_to_one_file=True,
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location=f"lora-{dest_type}-external.pb",
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)
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bare_model = write_external_data_tensors(base_model, dest_path)
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dest_file = path.join(dest_path, f"lora-{dest_type}.onnx")
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with open(dest_file, "wb") as model_file:
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model_file.write(bare_model.SerializeToString())
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logger.info("model saved, checking...")
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check_model(dest_file)
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logger.info("model successfully exported")
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if __name__ == "__main__":
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parser = ArgumentParser()
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parser.add_argument("--base", type=str)
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parser.add_argument("--dest", type=str)
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parser.add_argument("--type", type=str, choices=["text_encoder", "unet"])
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parser.add_argument("--lora_models", nargs='+', type=str)
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parser.add_argument("--lora_weights", nargs='+', type=float)
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args = parser.parse_args()
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logger.info("merging %s with %s with weights: %s", args.lora_models, args.base, args.lora_weights)
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merge_lora(args.base, args.lora_models, args.dest, args.type, args.lora_weights)
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