def Increment(self, counter_key, counter_increment=1):
    self._counter.setdefault(counter_key, 0)
    self._counter[counter_key] += counter_increment
Return a copied version of this tree. This is a deep copy in 
dataset/ETHPy150Open google/gfw-toolkit/toolkit/utils/report_utils.py/Counter.Increment--crossover with--dataset/ETHPy150Open charanpald/APGL/apgl/graph/DictTree.py/DictTree.deepCopy