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【Python】 Python viterbi算法

作者:Sephiroth / 发布于2011/1/10/ 843

<div>def InitDicForViterbi(nodes,posw,posdi,n): 
 newWordList = [] 
 # 解决未登录词 
 for i in nodes: 
 if not posw.has_key(i): 
 newWordList.append(i) 
 maxPosList = NPos(posdi,n) 
 print maxPosList 
 GenerateDicPos(newWordList,maxPosList,posw,posdi) 
 
def InitViterbi(node,posw,posdi): 
 viStatePath = [] 
 for i in posw[node]: 
 if i <> "@@@": 
 print "i:",i 
 viStatePath.append([posw[node][i]*posdi[i]["@@@"],[i]]) 
 return viStatePath</div>
<div>""" nodes 就是分好的词, posw 是词转换为词性的概率，posdi是词性之间的转换概率,n 是n个最大的词性将此用于未登录词中, 
 weightNone是未出现的词性转移的概率 
 nodes format {word1,word2...} , posw format {word1:{pos1:fre,pos2:fre,..."@@@":totalnum},..."@@@":total} 
 posdi format {pos1:{pos2:fre,pos3:fre...."@@@":total},...."@@@":total} 
 """ 
def Viterbi(nodes,posw,posdi,n,weightNone): 
 InitDicForViterbi(nodes,posw,posdi,n) 
 viStatePath = InitViterbi(nodes[0],posw,posdi) 
 length = len(nodes) 
 currentNode = 1 
 while currentNode < length: 
 currentPosList = posw[nodes[currentNode]] 
 paths = [] 
 # print "vstate:",viStatePath 
 for k in currentPosList: 
 if k <> "@@@": 
 ajk = weightNone 
 heap = [] 
 
 for j in xrange(len(viStatePath)): 
 # compute every state j to every state k in ti 
 # temppath = viStatePath[j] 
 # print "lastpos:",temppath 
 lastpos = viStatePath[j][1][-1] 
 lastweight = viStatePath[j][0] 
 lastposList = posdi[lastpos] 
 if lastposList.has_key(k): 
 ajk =lastposList[k] 
 currentweight = lastweight * ajk * currentPosList[k] 
 # print "viStatePath:",viStatePath[j][1] 
 pathNew = [data for data in viStatePath[j][1]] 
 pathNew.append(k) 
 # print "pathNew:",pathNew 
 heappush(heap,[currentweight,pathNew]) 
 
 # get the max possibility of state k in ti 
 
 # print "path:",path 
 paths.append(nlargest(1,heap)[0]) 
 del viStatePath 
 viStatePath = paths 
 # print "paths:",paths 
 currentNode = currentNode + 1 
 heap = [] 
 # get the max possibility path 
 for i in viStatePath: 
 heappush(heap,i) 
 return nlargest(1,heap)</div>
<div></div>
<div>"""nodes format {word1,word2,...} path is [weight,[pos1,pos2....]]""" 
def Result(nodes,path,edcode="utf-8"): 
 realPath = path[0][1] 
 ResultPrint(nodes,realPath,edcode) 
"""nodes format {word1,word2,...} path is [pos1,pos2....]""" 
def ResultPrint(nodes,path,edcode="utf-8"): 
 for i in xrange(len(nodes)): 
 print nodes[i].decode(edcode),"/",path[i].decode(edcode)</div>
<div></div>
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<div></div>
<div>aa = ConvertGBKtoUTF("球球") 
bb = ConvertGBKtoUTF("娃娃") 
cc = ConvertGBKtoUTF("吃饭") 
dd = ConvertGBKtoUTF("好") 
ee = ConvertGBKtoUTF("dddwieoewkem") 
dictions = {aa:{bb:1,"@@@":4},bb:{cc:2,aa:3,"@@@":40},"@@@":400} 
posdi = {"n":{"s":3,"v":3,"@@@":40},"s":{"v":2,"e":3,"@@@":33},"v":{"@@@":1},"@@@":100} 
posw = {aa:{"n":1,"v":3,"@@@":29},bb:{"n":1,"s":1,"@@@":19},cc:{"n":1,"@@@":1},"@@@":10002} 
 
nodes = [aa,bb,cc,ee,dd,bb,aa,cc] 
path = Viterbi(nodes,posw,posdi,3,0.01) 
print path 
Result(nodes,path)</div>
<div></div>

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