apriori algorithom in machine learning in action -

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the apriori algorithom

def apriorigen(lk, k): #creates ck     retlist = []     lenlk = len(lk)     in range(lenlk):         j in range(i+1, lenlk):              l1 = list(lk[i])[:k-2]; l2 = list(lk[j])[:k-2]             l1.sort(); l2.sort()             if l1==l2: #if first k-2 elements equal                 retlist.append(lk[i] | lk[j]) #set union     return retlist  l3 = [frozenset([0, 1, 2]), frozenset([0, 1, 3]), frozenset([1, 2, 4])]  l4 = apriorigen(l3, 4)  print l4

the result :[frozenset([0, 1, 2, 3])],

the algorithm right? why [frozenset([0, 1, 2, 4])] not including?


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