code: def _invalid_color_error_msg(bg_color) -> str:
      return (
          f"Invalid bg_color={bg_color}. Plese set bg_color to a 3-element"
          + " tensor. or a string (white | black), or a float."
      )
  
label_desc: Use image node_id 2 for calling a global function with example usage: _invalid_color_error_msg(bg_color) and returns: unknown