rapids_sagemaker_hpo.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/hyperparameter_tuning/rapids_bring_your_own/rapids_sagemaker_hpo.ipynb

Error:

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Exception encountered at "In [4]":
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IndexError Traceback (most recent call last)
in
1 # please choose dataset S3 bucket and directory
----> 2 data_bucket = 'sagemaker-rapids-hpo-' + region[0]
3 dataset_directory = '3_year' # '3_year', '10_year', 'NYC_taxi'
4
5 # please choose output bucket for trained model(s)

IndexError: list index out of range

Open hyperparameter_tuning/rapids_bring_your_own/rapids_sagemaker_hpo.ipynb and inspect the region setup before cell 4, where the IndexError occurs while building data_bucket. Run the notebook or its CI validation to reproduce the failure; done means the notebook completes validation without this error.

Written by the indexing model from the issue text.