Nastttka

Failed to compile keras_01_mnist notebook [link to the cell](https://colab.research.google.com/github/GoogleCloudPlatform/tensorflow-without-a-phd/blob/master/tensorflow-mnist-tutorial/keras_01_mnist.ipynb#scrollTo=yZ4tjPKvL2eh&line=1&uniqifier=1) `ValueError Traceback (most recent call last) [](https://localhost:8080/#) in () 2 (training_digits, training_labels, 3 validation_digits, validation_labels) = dataset_to_numpy_util(training_dataset, validation_dataset, N) ----> 4...