Add amp cifar10 validation #1669
                
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Fixes #1666
Description: Update cifar10 example, use validation with amp
I test on the colab like here: https://colab.research.google.com/drive/1E9zJrptnLJ_PKhmaP5Vhb6DTVRvyrKHx (replacing my file instead of the master one) as @vfdev-5 suggested. The experiment ran perfectly
Check list: