Import a tf.Tensor, producing a LaidOutTensor.

    Args:
      x: a Tensor
      tf_x: a tf.Tensor
    Returns:
      a LaidOutTensor

def import_tf_tensor(self, x, tf_x):
    """Import a tf.Tensor, producing a LaidOutTensor.

    Args:
      x: a Tensor
      tf_x: a tf.Tensor
    Returns:
      a LaidOutTensor
    """
    return self.LaidOutTensor(self.make_slices(tf_x, x.shape))