def __init__(self, witness_a, witness_b):
        '''
        Constructor
        '''
        self.witness_a = witness_a
        self.witness_b = witness_b
        self.tree = DecisionTree(self)
def __init__ ( self , witness_a , witness_b ) : self . witness_a = witness_a self . witness_b = witness_b self . tree = DecisionTree ( self )
Constructor