code: def read_u32(self):
      data = self.f.read(4)
      return struct.unpack("<I", data)[0]
  
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 9 for calling the GGUFReader obj's underlying member method code with example usage: obj.read_u32() and returns: struct