mxnet_mnist_with_gluon.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/sagemaker-python-sdk/mxnet_gluon_mnist/mxnet_mnist_with_gluon.ipynb

Error:

---------------------------------------------------------------------------
Exception encountered at "In [9]":
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
in
----> 1 response = predictor.predict(data)
2 print(int(response))

NameError: name 'data' is not defined

Open sagemaker-python-sdk/mxnet_gluon_mnist/mxnet_mnist_with_gluon.ipynb and inspect the cells before In [9] to determine why data is unavailable when predictor.predict(data) runs. Run the notebook through the same CI path and confirm it completes without the NameError.

Written by the indexing model from the issue text.