code: def get_hash(path: Path, chunk_num_blocks: int = 128) -> str:
      """Get the hash of a file."""
      h = hashlib.blake2b(digest_size=20)
      if not path.exists():
          raise FileNotFoundError(f"{path} does not exist")
      with path.open("rb") as f:
          for chunk in iter(
              lambda: f.read(chunk_num_blocks * h.block_size), b""
          ):
              h.update(chunk)
      return h.hexdigest()
  
label_desc: Use image node_id 1 for calling a global function with example usage: get_hash(path, chunk_num_blocks) and returns: h