find-s 算法

实现《机器学习》19页的FIND-S算法。

验证不同的实例顺序

开始于非最特殊假设。

#__author__=lx

#__date__=2011.10.18

#__brief__=FIND-S, from 'machine learning' 19



def find_s():

        

        x1 = [ 'sunny', 'warm', 'nurmal', 'strong', 'warm', 'same' , 1 ]

        x2 = [ 'sunny', 'warm', 'high', 'strong', 'warm', 'same' , 1 ]

        x3 = [ 'rainy', 'cold', 'high', 'strong', 'warm', 'change', 0 ]

        x4 = [ 'sunny', 'warm', 'high', 'strong', 'cool', 'change', 1 ]



        h = [ None, None, None, None, None, None ]

        h1 = [ 'sunny', 'cold', 'high', 'strong', 'warm', 'change' ]



        xa = [ x1, x2, x3, x4 ]

        

        xb = [ x2, x3, x4, x1 ]



        for i in xb:

                if i[6] == 1:

                        index = 0

                        for j in i[ :-1 ]:

                                if ( h1[index] == None ):

                                        h1[index] = j

                                elif ( h1[index] != j ):

                                        h1[index] = '?'

                                index += 1



        for i in h1:

                print i

                                

                                        





if __name__ == "__main__":

        find_s();