pytorch_mnist.ipynb failed CI

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

Error:

---------------------------------------------------------------------------
Exception encountered at "In [2]":
---------------------------------------------------------------------------
HTTPError Traceback (most recent call last)
in
3 datasets.MNIST('data', download=True, transform=transforms.Compose([
4 transforms.ToTensor(),
----> 5 transforms.Normalize((0.1307,), (0.3081,))
6 ]))

/opt/conda/lib/python3.6/site-packages/torchvision/datasets/mnist.py in __init__(self, root, train, transform, target_transform, download)
77
78 if download:
---> 79 self.download()
80
81 if not self._check_exists():

/opt/conda/lib/python3.6/site-packages/torchvision/datasets/mnist.py in download(self)
144 for url, md5 in self.resources:
145 filename = url.rpartition('/')[2]
--> 146 down

[...]

HTTPError: HTTP Error 503: Service Unavailable

Open sagemaker-python-sdk/pytorch_mnist/pytorch_mnist.ipynb and inspect cell In [2], where torchvision downloads MNIST and CI receives HTTP 503. Reproduce the notebook or its CI check, then verify that the notebook completes successfully without the download failure.

Written by the indexing model from the issue text.