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## Breaking Changes
* Increases the **minimum bazel version** required to build TF to **3.1.0**.
* `tf.data`
* Makes the following (breaking) changes to the `tf.data` C++ API: - `IteratorBase::RestoreInternal`, `IteratorBase::SaveInternal`, and `DatasetBase::CheckExternalState` become pure-virtual and subclasses are now expected to provide an implementation.
* Makes the following (breaking) changes to the `tf.data`.
* C++ API: - `IteratorBase::RestoreInternal`, `IteratorBase::SaveInternal`, and `DatasetBase::CheckExternalState` become pure-virtual and subclasses are now expected to provide an implementation.
* The deprecated `DatasetBase::IsStateful` method is removed in favor of `DatasetBase::CheckExternalState`.
* Deprecated overrides of `DatasetBase::MakeIterator` and `MakeIteratorFromInputElement` are removed.
* The signature of `tensorflow::data::IteratorBase::SaveInternal` and `tensorflow::data::IteratorBase::SaveInput` has been extended with `SerializationContext` argument to enable overriding the default policy for the handling external state during iterator checkpointing. This is not a backwards compatible change and all subclasses of `IteratorBase` *need to be updated* accordingly.
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* Deprecate `tf.group`. It is not useful in eager mode.
* Add a new variant of `FTRL` allowing a learning rate of zero.
### `tf.data:
### `tf.data`:
* `tf.data.experimental.dense_to_ragged_batch` works correctly with tuples.
* `tf.data.experimental.dense_to_ragged_batch` to output variable ragged rank.
* `tf.data.experimental.cardinality` is now a method on `tf.data.Dataset`.