| """ |
| Usage: |
| python3 -m fastchat.model.apply_delta --base ~/model_weights/llama-7b --target ~/model_weights/vicuna-7b --delta lmsys/vicuna-7b-delta |
| """ |
| import argparse |
|
|
| import torch |
| from tqdm import tqdm |
| from transformers import AutoTokenizer, AutoModelForCausalLM |
| from objectrelator import LlavaLlamaForCausalLM |
|
|
|
|
| def apply_delta(base_model_path, target_model_path, delta_path): |
| print("Loading base model") |
| base = AutoModelForCausalLM.from_pretrained( |
| base_model_path, torch_dtype=torch.float16, low_cpu_mem_usage=True) |
|
|
| print("Loading delta") |
| delta = LlavaLlamaForCausalLM.from_pretrained(delta_path, torch_dtype=torch.float16, low_cpu_mem_usage=True) |
| delta_tokenizer = AutoTokenizer.from_pretrained(delta_path) |
|
|
| print("Applying delta") |
| for name, param in tqdm(delta.state_dict().items(), desc="Applying delta"): |
| if name not in base.state_dict(): |
| assert name in ['model.mm_projector.weight', 'model.mm_projector.bias'], f'{name} not in base model' |
| continue |
| if param.data.shape == base.state_dict()[name].shape: |
| param.data += base.state_dict()[name] |
| else: |
| assert name in ['model.embed_tokens.weight', 'lm_head.weight'], \ |
| f'{name} dimension mismatch: {param.data.shape} vs {base.state_dict()[name].shape}' |
| bparam = base.state_dict()[name] |
| param.data[:bparam.shape[0], :bparam.shape[1]] += bparam |
|
|
| print("Saving target model") |
| delta.save_pretrained(target_model_path) |
| delta_tokenizer.save_pretrained(target_model_path) |
|
|
|
|
| if __name__ == "__main__": |
| parser = argparse.ArgumentParser() |
| parser.add_argument("--base-model-path", type=str, required=True) |
| parser.add_argument("--target-model-path", type=str, required=True) |
| parser.add_argument("--delta-path", type=str, required=True) |
|
|
| args = parser.parse_args() |
|
|
| apply_delta(args.base_model_path, args.target_model_path, args.delta_path) |
|
|
