code: def dot_distance(t1, t2, name=None):
    
    with tf.name_scope(name, 'dot_distance', [t1, t2]) as scope:
      return -dot_product(t1, t2, name=scope)
docs: dot "distance" between t1 and t2.
  
    Args:
      t1: A tensor.
      t2: A tensor that is the same size as t1.
      name: Optional name for this op.
    Returns:
      The dot distance between t1 and t2.