code: def __init__(self, f: BufferedReader):
      data = f.read(GGUFHeader.size)
  
      magic = data[0:4].decode()
      invalidInputError(magic == "GGUF", "not a valid gguf file")
  
      version, n_tensors, n_kv = struct.unpack("<IQQ", data[4:])
      invalidInputError(
          version in [2, 3], "only gguf v2 and v3 is supported"
      )
  
      self.magic = magic
      self.version = version
      self.n_tensors = n_tensors
      self.n_kv = n_kv
  
imports: import struct
  import functools
  import torch
  import numpy
  from io import BufferedReader
  from tqdm import tqdm
  from bigdl.llm.utils.common import invalidInputError
label_desc: Use image node_id 1 to create a new GGUFHeader object  with example: obj = GGUFHeader(f)