#!/usr/bin/env python
# -*- coding: utf-8 -*-
from thinkbayes import Pmf
pmf1 = Pmf()
for x in range(1, 6 + 1):
pmf1.Set(x, 1 / 6.0)
pmf1.Print()
print("曲奇饼问题")
pmf2 = Pmf()
pmf2.Set('Bowl1', 0.5)
pmf2.Set('Bowl2', 0.5)
pmf2.Mult('Bowl1', 0.75)
pmf2.Mult('Bowl2', 0.5)
pmf2.Normalize()
print pmf2.Probs(pmf2.Values())
from thinkbayes import Pmf
# make empty pmf
pmf = Pmf()
pmf.Set('Bowl 1', .5) # P(Bowl 1)
pmf.Set('Bowl 2', .5) # P(Bowl 2)
pmf.Print()
# picks vanilla cookie - update P of bowl with evidence
pmf.Mult('Bowl 1', .75) # P(Vanilla | Bowl 1)
pmf.Mult('Bowl 2', .5) # P(Vanilla | Bowl 2)
pmf.Print()
print pmf.Normalize()
pmf.Print()
# picks chocolate cookie - update the pmf with new evidence
pmf.Mult('Bowl 1', .25) # P(Chocolate | Bowl 1)
pmf.Mult('Bowl 2', .5) # P(Chocolate | Bowl 2)
pmf.Print()
print pmf.Normalize()
pmf.Print()