def METHOD_NAME(self):
    """ gathers meta data associated with the model. """
    num_parms = 0
    num_invocations = 0
    num_macs = 0
    type_lines = []
    for typ, stats in self.get_stats_by_type().items():
        num_parms += stats['parms']
        num_invocations += stats['uses']
        num_macs += stats['macs']
        type_lines.append("%12s : %3d %8d %2d %10d" %
                          (typ, stats['nodes'], stats['parms'], stats['uses'], stats['macs']))
    return num_parms, num_invocations, num_macs, type_lines