Continuation of #858 for #839 Cifar10 revision

[BaruchG]

What does this PR do?

This continue work of #858. Wrote unit test for the CIFAR10 dataset and made the dataset import from torchvision to reduce code redundancy as outlined in #839.

Fixes #839

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[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.