Returns set of nth-farthest input tensors and labels.

    Returns:
      1. tf.Tensor (`batch_size`, `num_objects`,
                     (`num_features` + 3 * `num_objects`)).
      2. tf.Tensor (`batch_size`). Output object reference label.

def get_batch(self):
    """Returns set of nth-farthest input tensors and labels.

    Returns:
      1. tf.Tensor (`batch_size`, `num_objects`,
                     (`num_features` + 3 * `num_objects`)).
      2. tf.Tensor (`batch_size`). Output object reference label.
    """
    params = [self._batch_size, self._num_objects, self._num_features]
    inputs, labels = tf.py_func(self._get_batch_data, params,
                                [tf.float32, tf.float32])
    inputs = tf.reshape(inputs, [self._batch_size, self._num_objects,
                                 self._num_features + self._num_objects * 3])
    labels = tf.reshape(labels, [-1])
    return inputs, labels