TensorFlow Federated 0.68.0

Release 0.68.0

Major Features and Improvements

• Added tff.types.tensorflow_to_type function to convert structures
  containing tensorflow type specs into a tff.Type.
• Deprecated tff.types.infer_unplaced_type.
• Updated tff.types.ArrayShape to be defined as a Sequence not an
  Iterable, this is because the len of an tff.types.ArrayShape is used
  for comparison.
• Deprecated the type_signature parameter for the
  tff.program.ReleaseManager.release method.

Breaking Changes

• Removed the implementation of tff.Value.__add__.
• Removed the deprecated tff.Type.check_*() functions, use isinstance
  instead.
• Removed tff.types.at_clients and tff.types.at_server functions, use the
  tff.FederatedType constructor instead.
• Removed support for handling tf.data.DatasetSpec, tf.RaggedTensorSpec,
  and tf.SparseTensorSpec using tff.to_type, use
  tff.types.tensorflow_to_type instead.
• Removed support for handling tf.RaggedTensor and tf.SparseTensor using
  infer_type.