code: def join(input_layer, others, include_self=True, join_function=None):
    
    if include_self:
      list_of_tensors = [input_layer]
      list_of_tensors.extend(others)
    else:
      list_of_tensors = others
    return prettytensor.join_pretty_tensors(list_of_tensors, input_layer,
                                            join_function)
docs: Joins the provided PrettyTensors with this using the join function.
  
    Args:
      input_layer: The input layer for this op.
      others: Sequence of PrettyTensor objects.
      include_self: Whether or not this includes itself or if the value is only
        derived from others.
      join_function: The function to use for joining, must accept a list of
        tensors. Use None for concat on the final dimension.
    Returns:
      self.