object_detection_recordio_format.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/introduction_to_amazon_algorithms/object_detection_pascalvoc_coco/object_detection_recordio_format.ipynb

Error:

---------------------------------------------------------------------------
Exception encountered at "In [12]":
---------------------------------------------------------------------------
NameError Traceback (most recent call last)
in
----> 1 train_data = sagemaker.session.s3_input(s3_train_data, distribution='FullyReplicated',
2 content_type='application/x-recordio', s3_data_type='S3Prefix')
3 validation_data = sagemaker.session.s3_input(s3_validation_data, distribution='FullyReplicated',
4 content_type='application/x-recordio', s3_data_type='S3Prefix')
5 data_channels = {'train': train_data, 'validation': validation_data}

NameError: name 's3_train_data' is not defined

Open introduction_to_amazon_algorithms/object_detection_pascalvoc_coco/object_detection_recordio_format.ipynb and inspect the cells leading to In [12], where the reported NameError occurs. Re-run the notebook through that cell and confirm the CI failure is resolved without the undefined-name error.

Written by the indexing model from the issue text.