mxnet_mnist.ipynb failed CI

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

Error:

---------------------------------------------------------------------------
Exception encountered at "In [5]":
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AttributeError Traceback (most recent call last)
in
1 neo_optimize = False
2 compiled_model = mnist_estimator
----> 3 if mnist_estimator.create_model().check_neo_region(boto3.Session().region_name) is False:
4 print('Neo is not currently supported in', boto3.Session().region_name)
5 else:

AttributeError: 'MXNetModel' object has no attribute 'check_neo_region'

Open sagemaker-python-sdk/mxnet_mnist/mxnet_mnist.ipynb and inspect In [5], where the CI failure occurs. Reproduce the notebook failure and investigate the MXNetModel API usage around check_neo_region. Done means the notebook no longer raises this AttributeError and the CI check passes.

Written by the indexing model from the issue text.