@cassiopeia.type.core.common.immutablemethod
    def champion_mastery_score(self):
        return cassiopeia.riotapi.get_champion_mastery_score(self)
initialize Mondrian tree data structure and sample restriction of Mondrian tree to current training data
dataset/ETHPy150Open meraki-analytics/cassiopeia/cassiopeia/type/core/summoner.py/Summoner.champion_mastery_score--crossover with--dataset/ETHPy150Open balajiln/mondrianforest/src/mondrianforest.py/MondrianTree.__init__