code: def import_tf_tensor(self, x, tf_x):
      
      return self.LaidOutTensor(self.make_slices(tf_x, x.shape))
docs: Import a tf.Tensor, producing a LaidOutTensor.
  
      Args:
        x: a Tensor
        tf_x: a tf.Tensor
      Returns:
        a LaidOutTensor