code: def _read32(bytestream):
      dt = numpy.dtype(numpy.uint32).newbyteorder(">")
      return numpy.frombuffer(bytestream.read(4), dtype=dt)[0]
  
file_path: analytics-zoo/pyzoo/zoo/pipeline/api/keras/datasets/mnist.py
imports: import gzip
  import numpy
  from bigdl.dataset import base
label_desc: Use image node_id 1 for calling a global function with example usage: _read32(bytestream) and returns: numpy