TensorFlow Federated 0.25.0

Release 0.25.0

Major Features and Improvements

• Adds error message logging to TFF C++ execution context.
• Adds test coverage for C++ runtime with aggregators.
• Redefines 'workers going down with fixed clients per round' test.
• Add complete examples of using DataBackend with TFF comps.
• Updated the MapReduceForm documentation to include the two additional secure
  sum intrinsics.
• tff.learning
  • Relax the type check on LearningProcess from strictly SequenceType to
    also allow structures of SequenceType.

Breaking Changes

• Remove usage of tff.test.TestCase, tff.test.main(), and delete
  test_case module.
• Update test utility docstrings to use consistent vocabulary.
• Update to TensorFlow 2.9.0
• Rename up compiler/test_utils to compiler/building_block_test_utils.
• Remove some unnecessary usage of pytype: skip-file.
• Specify the None return type of ReleaseManager.release.
• Remove usage of deprecated numpy types.
• Replace depreciated random_integers with randint.

Bug Fixes

• Fix numpy warning.