losses. It now computes mean over the last axis of per-sample losses
        before applying the reduction function.
*   AutoGraph no longer converts functions passed to `tf.py_function`,
    `tf.py_func` and `tf.numpy_function`.
*   Deprecating `XLA_CPU` and `XLA_GPU` devices with this release.
*   Increasing the minimum bazel version to build TF to 2.0.0 to use Bazel's
    `cc_experimental_shared_library`.