code: def _read_byte(f):
      """Read a single byte"""
      return np.uint8(struct.unpack(">B", f.read(4)[:1])[0])
  
imports: import struct
  import numpy
  import tempfile
  import zlib
  import warnings
label_desc: Use image node_id 4 for calling a global function with example usage: _read_byte(f) and returns: np