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Enables TensorFlow 2.x behaviors.

This function can be called at the beginning of the program (before Tensors, Graphs or other structures have been created, and before devices have been initialized. It switches all global behaviors that are different between TensorFlow 1.x and 2.x to behave as intended for 2.x.

This function is called in the main TensorFlow file, user should not need to call it, except during complex migrations.