chainer_single_machine_cifar10.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/sagemaker-python-sdk/chainer_cifar10/chainer_single_machine_cifar10.ipynb

Error:

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Exception encountered at "In [2]":
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ModuleNotFoundError Traceback (most recent call last)
in
----> 1 import chainer
2
3 from chainer.datasets import get_cifar10
4
5 train, test = get_cifar10()

ModuleNotFoundError: No module named 'chainer'

Open sagemaker-python-sdk/chainer_cifar10/chainer_single_machine_cifar10.ipynb and inspect the failing In [2] cell and the CI environment that runs it. Reproduce the missing chainer import, then verify the notebook completes that cell and the CI check passes.

Written by the indexing model from the issue text.