code: def minimal_example(filename: str) -> None:
      reader = GGUFReader(filename, "r+")
      field = reader.fields["tokenizer.ggml.bos_token_id"]
      if field is None:
          return
      part_index = field.data[0]
      field.parts[part_index][0] = 2
  
file_path: llama.cpp/gguf-py/scripts/gguf-set-metadata.py
imports: import argparse
  import os
  import sys
  from pathlib import Path
  from gguf import GGUFReader
label_desc: Use image node_id 1 for calling a global function with example usage: minimal_example(filename) without return types