* (C++) `DatasetBase::MakeIterator()` has been renamed to `DatasetBase::MakeIteratorInternal()`.
* (C++) `IteratorBase::Initialize()` method was added to support raising errors during iterator construction.
* Eager Execution:
+ * Added the ability to pause recording operations for gradient computation via `tf.GradientTape.stop_recording`.
+ * Updated documentation, introductory notebooks.
* `tf.keras`:
* Move Keras code out of _impl folder and remove API files.
* `tf.keras.Model.save_weights` now saves in TensorFlow format by default.