def getReplacementPotential(self):
'''how useful is it to start a new classi from this node including it's redichotomisation'''
###gotta think it through!
v = len(self.samples)
if self.isTerminal:
v *= helpers.getBoolEntropy(self.samples,self.keyStatements)
else:
v *= helpers.getInformationGain(self.samples,self.dichotomy,self.keyStatements)- self.getInformationGain(self)
return v
def getInformationGain(self):
'''information gain of a given dichotomy for the last update'''
assert (not self.isTerminal)
return helpers.getInformationGain(self)