Estimator. See
        [README](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/distribute)
        for more details.
*   Add C, C++, and Python functions for querying kernels.

## Breaking Changes

*   Keras:
    *   The default values for tf.keras `RandomUniform`, `RandomNormal`, and
        `TruncatedNormal` initializers have been changed to match those in