r_sagemaker_hello_world.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/r_examples/r_sagemaker_hello_world/r_sagemaker_hello_world.ipynb

Error:

---------------------------------------------------------------------------
Exception encountered at "In [1]":
File "", line 2
sagemaker <- import('sagemaker')
^
SyntaxError: invalid syntax

Open r_examples/r_sagemaker_hello_world/r_sagemaker_hello_world.ipynb and inspect the first cell and its selected kernel. Reproduce the CI failure to determine why R syntax is being parsed as Python; done means the notebook runs successfully in CI with the intended SageMaker example behavior.

Written by the indexing model from the issue text.