code: def transformer(data, label):
      data = data.reshape((-1,)).astype(np.float32) / 255
      return data, label
  
file_path: sagemaker-python-sdk/tests/data/mxnet_mnist/mnist_gluon.py
imports: import argparse
  import random
  import mxnet
  import numpy
  from mxnet import autograd, gluon
  from mxnet.gluon import nn
label_desc: Use image node_id 4 for calling a global function with example usage: transformer(data, label) and returns: data,  label