*   `tf.random`:
    * Added `tf.random.experimental.index_shuffle`, for shuffling a sequence without materializing the sequence in memory.

*   `tf.RaggedTensor`:
    *   Introduced `tf.experimental.RowPartition`, which encodes how one dimension in a RaggedTensor relates to another, into the public API.
    *   Introduced `tf.experimental.DynamicRaggedShape`, which represents the shape of a RaggedTensor.

## Security

    symlink_force(filepath, new_filepath)


def validate_cuda_config(environ_cp):
  """Run find_cuda_config.py and return cuda_toolkit_path, or None."""

  def maybe_encode_env(env):
    """Encodes unicode in env to str on Windows python 2.x."""
    if not is_windows() or sys.version_info[0] != 2:
      return env
    for k, v in env.items():
      if isinstance(k, unicode):
        k = k.encode('ascii')