OperatorNotAllowedInGraphError: iterating over `tf.Tensor` is not allowed in Graph execution. Use Eager execution or decorate this function with @tf.function

Hi

I was just trying to run your tutorials notebook when I ran into this error. I'm running my code on colab and I can't change tf version to 1.14 as colab sets it to 1.15.

I hope someone can help me here.

Thanks