def METHOD_NAME (solution):
  macroTile0 = solution["MacroTile0"]
  macroTile1 = solution["MacroTile1"]
  globalSplitU = solution["GlobalSplitU"]
  localSplitU = solution["WorkGroup"][2]
  key = "%s_%s_%s_%s" % (macroTile0, macroTile1, localSplitU, globalSplitU)
  return key