issue:

following this guide:
https://www.kubeflow.org/docs/components/training/user-guides/pytorch/

which is using this image:

gcr.io/kubeflow-ci/pytorch-dist-mnist_test:1.0

that attempts to download this file:

http://yann.lecun.com/exdb/mnist/train-images-idx3-ubyte.gz

but as of today, requesting this link gets 403 status.

here you can see the proper output for this image:
https://developer-qa.nvidia.com/blog/gpu-containers-runtime/#:~:text=Try%20running%20the%20MNIST%20training%20example%20included%20with%20the%20container%3A

suggestions:

1. use links from this mirror instead, which is hosted on github and probably will be more reliable

https://github.com/fgnt/mnist

2. allow to provide links to these files using env vars, to prevent hardcoding links that might be dead sometime.

notes:
i assume this link is hardcoded in a script which is used in the dockerfile used to build this image.
i found several references to this link across the kubeflow github:
https://github.com/search?q=org%3Akubeflow%20%22train-images-idx3-ubyte.gz%22&type=code
but couldn't trace the dockerfile used to build this image, nor detect which of these scripts was used in it.