Delete bf16_cast_block_int8.py
Browse files- bf16_cast_block_int8.py +0 -63
bf16_cast_block_int8.py
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import os
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import json
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from argparse import ArgumentParser
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from glob import glob
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from tqdm import tqdm
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import torch
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from safetensors.torch import load_file, save_file
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from huggingface_hub import snapshot_download
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from kernel import weight_quant
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def main(bf16_path, int8_path, model_name="deepseek-ai/DeepSeek-R1"):
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torch.set_default_dtype(torch.bfloat16)
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os.makedirs(int8_path, exist_ok=True)
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model_index_file = os.path.join(int8_path, "model.safetensors.index.json")
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if not os.path.exists(model_index_file):
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snapshot_download(
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repo_id=model_name,
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allow_patterns=["model.safetensors.index.json"],
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local_dir=int8_path,
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local_dir_use_symlinks=False
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)
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print(f"model index file downloaded to {model_index_file}")
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with open(model_index_file, "r") as f:
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model_index = json.load(f)
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weight_map = model_index["weight_map"]
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scale_count = len([key for key in weight_map.keys() if key.endswith("_scale_inv")])
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safetensor_files = list(glob(os.path.join(bf16_path, "*.safetensors")))
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safetensor_files.sort()
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quant_count = 0
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for safetensor_file in tqdm(safetensor_files):
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file_name = os.path.basename(safetensor_file)
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state_dict = load_file(safetensor_file, device="cuda")
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new_state_dict = {}
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for weight_name, weight in state_dict.items():
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scale_inv_name = f"{weight_name}_scale_inv"
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if scale_inv_name in weight_map:
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assert weight.element_size() == 2
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quant_count += 1
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int8_weight, scale_inv = weight_quant(weight)
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new_state_dict[weight_name] = int8_weight
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new_state_dict[scale_inv_name] = scale_inv
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else:
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new_state_dict[weight_name] = weight
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new_safetensor_file = os.path.join(int8_path, file_name)
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save_file(new_state_dict, new_safetensor_file)
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assert quant_count == scale_count
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print(f"{quant_count} weights are quantized.")
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if __name__ == "__main__":
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parser = ArgumentParser()
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parser.add_argument("--input-bf16-hf-path", type=str, required=True)
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parser.add_argument("--output-int8-hf-path", type=str, required=True)
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parser.add_argument("--model-name", type=str, default="deepseek-ai/DeepSeek-R1")
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args = parser.parse_args()
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main(args.input_bf16_hf_path, args.output_int8_hf_path, args.model_name)
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print("done")
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