chainer_single_machine_cifar10.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/hyperparameter_tuning/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 hyperparameter_tuning/chainer_cifar10/chainer_single_machine_cifar10.ipynb and inspect the code at In [2]. First reproduce the CI failure and check how the notebook environment installs dependencies. Done means the notebook's Chainer import and CI execution no longer fail with ModuleNotFoundError.

Written by the indexing model from the issue text.