挖掘DBLP作者合作关系，FP-Growth算法实践（5）：挖掘研究者合作

def FindParentTreeNodes(baseTreeNode):
    parentTreeNodes=[]
    while baseTreeNode.parentPointer is not None: #while baseTreeNode is not the ROOT node whose parentPointer is None and authorName is "NULL"
        parentTreeNodes.append(baseTreeNode.authorName)
        baseTreeNode=baseTreeNode.parentPointer
    return parentTreeNodes

def FindCondAuthorDB(firstChildPointerTreeNode):
    condAuthorDB={} #entry: {frozenset(authorListSet): frequence}
    tempTreeNode=firstChildPointerTreeNode
    while tempTreeNode is not None:
        parentTreeNodes=FindParentTreeNodes(tempTreeNode)
        if len(parentTreeNodes)>1:
            condAuthorDB[frozenset(parentTreeNodes[1:])]=tempTreeNode.frequence
            #parentTreeNodes[1:],remove self treeNode
        tempTreeNode=tempTreeNode.brotherPointer
    return condAuthorDB

def CreateCondHeaderTable(condAuthorDB,minSupport=1):
    condHeaderTable={} #entry: {authorName: frequence,firstChildPointer}
    for i,frequence) in enumerate(condAuthorDB.items()):
        print "cond trans","=="*20
        for author in authorListSet:
            if condHeaderTable.has_key(author):
                headerTable[author][0]+=frequence
            else:
                condHeaderTable[author]=[frequence,None]
    for author in condHeaderTable.keys():
        if condHeaderTable[author][0]<minSupport:
            del condHeaderTable[author]
    return condHeaderTable

'''
headerTable={} #entry: {authorName: frequence,endYear}
if we want to call MineCondTree(),brotherPointer=None)
'''    
def MineTree(treeRoot,minSupport=1,baseFreqAuthorSet=set([]),finalFreqAuthorPattDict={}):
    sortedAuthorsList=[value[0] for value in sorted(headerTable.items(),reverse=False)]
    for baseAuthor in sortedAuthorsList: #start from bottom of headerTable
        newFreqAuthorSet=baseFreqAuthorSet.copy()
        newFreqAuthorSet.add(baseAuthor)
        finalFreqAuthorPattDict[frozenset(newFreqAuthorSet)]=headerTable[baseAuthor][0]
        condAuthorDB=FindCondAuthorDB(headerTable[baseAuthor][1]) #[1] is the firstChildPointer
        condHeaderTable=CreateCondHeaderTable(condAuthorDB,minSupport)
        condTreeRoot=CreateTree(condAuthorDB,condHeaderTable) #call CreateCondTree()
        if condHeaderTable is not None:
            MineTree(condTreeRoot,condHeaderTable,minSupport,newFreqAuthorSet,finalFreqAuthorPattDict) #call MineCondTree()

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