Ñò †ËKc @sûdZddklZddklZlZddklZlZl Z ddkl Z l Z l Z l Z d„Zddd„ƒYZd „Zed jo[dd kZeid ed eieiBƒ\ZZeoe o deGHneƒnd S(sBDOP1 implementation. Andreas van Cranenburgh iÿÿÿÿ(t defaultdict(tchaintcount(t ProductiontWeightedProductiontWeightedGrammar(tTreet NonterminaltFreqDisttInsideChartParserccs1x*|D]"}x|D]}||fVqWqWdS(s$ cartesian product of two sequences N((tatbtxty((s/home/andreas/coglang/dopg.pytcartprod s t GoodmanDOPcBsDeZdd„Zd„Zdd„Zd„Zd„Zd„ZRS(tScCsgtƒtƒ}}}xY|D]Q}|i||ƒ}|i||ƒ|i||ƒ|i|i||ƒƒq!W|i||ƒ|_|iƒ|_ |i ƒ|_ t d„|i ƒDƒƒ|_ tt|ƒ|iƒ|_t|iƒ|_|`~~dS(s¯ initialize a DOP model given a treebank. uses the Goodman reduction of a STSG to a PCFG. after initialization, self.parser will contain an InsideChartParser. >>> tree = Tree("(S (NP mary) (VP walks))") >>> d = GoodmanDOP([tree]) >>> d.parser.nbest_parse("mary walks".split())[0] ProbabilisticTree('S', [ProbabilisticTree('NP@1', ['mary']) (p=0.5), ProbabilisticTree('VP@2', ['walks']) (p=0.5)]) (p=0.111111111111)css@x9|]2}d|jo|idƒddd…VqqWdS(t@Niÿÿÿÿ(tsplit(t.0R ((s/home/andreas/coglang/dopg.pys /s N(RRtdecorate_with_idstnodefreqtextendtgoodmant probabilitiestpcfgtnextt addressestkeyst nonterminalstdictt nonterminalRRtgrammarR tparser(tselfttreebankt rootsymboltcfgt nonterminalfdtuuidsttreetutree((s/home/andreas/coglang/dopg.pyt__init__s  cCsF|itƒ}x0|iƒD]"}d|i|iƒf|_qW|S(s$ add unique identifiers to each non-terminal of a tree. >>> tree = Tree("(S (NP mary) (VP walks))") >>> d = GoodmanDOP([tree]) >>> d.decorate_with_ids(tree, count()) Tree('S@0', [Tree('NP@1', ['mary']), Tree('VP@2', ['walks'])]) @param uuids: an iterator yielding a stream of IDss%s@%d(tcopytTruetsubtreestnodeR(R"R(R'R)R ((s/home/andreas/coglang/dopg.pyR6s   ics„t|tƒoSt|ƒdjo@td„‡‡fd†|Dƒƒ}ˆi|id|ƒ|Sˆit|ƒd|ƒ|SdS(sfcount frequencies of nodes by calculating the number of subtrees headed by each node. >>> fd = FreqDist() >>> tree = Tree("(S (NP mary) (VP walks))") >>> d = GoodmanDOP([tree]) >>> d.nodefreq(tree, fd) 9 >>> fd.items() [('S', 9), ('NP', 2), ('VP', 2), ('mary', 1), ('walks', 1)] @param nonterminalfd: the FreqDist to store the counts in.icSs||S(((R R ((s/home/andreas/coglang/dopg.pytRsc3s)x"|]}ˆi|ˆƒdVqWdS(iN(R(RR (R"R&(s/home/andreas/coglang/dopg.pys Ss RN(t isinstanceRtlentreducetincR.tstr(R"R(R&tleavestn((R&R"s/home/andreas/coglang/dopg.pyRDs # ccsÃx¼t|iƒ|iƒƒD]Ÿ\}}t|iƒƒdjo|iƒ|iƒf}n"tt|iƒ|iƒƒŒ}x:t|iƒ|iƒf|ƒD]\}}||fVq WqWdS(sÛ given a parsetree from a treebank, yield a goodman reduction of eight rules per node. >>> tree = Tree("(S (NP mary) (VP walks))") >>> d = GoodmanDOP([tree]) >>> utree = d.decorate_with_ids(tree, count()) >>> list(d.goodman(tree, utree)) [(S, (NP, VP)), (S, (NP, VP@2)), (S, (NP@1, VP)), (S, (NP@1, VP@2)), (NP, ('mary',)), (NP, ('mary',)), (NP@1, ('mary',)), (NP@1, ('mary',)), (VP, ('walks',)), (VP, ('walks',)), (VP@2, ('walks',)), (VP@2, ('walks',))]iN(tzipt productionsR1trhsRtlhs(R"R(R)tptupR9tltr((s/home/andreas/coglang/dopg.pyRZs  !" c sL‡fd†}g}|D]+\}}|t||d|||ƒƒq~S(sÆmerge cfg and frequency distribution into a pcfg with the right probabilities. @param cfg: a list of Productions @param nonterminalfd: a FreqDist of (non)terminals (with and without IDs)cs6td„t‡fd†|ƒƒtˆt|ƒƒS(NcSs||S(((R R ((s/home/andreas/coglang/dopg.pyR/scs(dt|ƒjoˆt|ƒpdS(Ri(R4(tz(R&(s/home/andreas/coglang/dopg.pyR/s(R2tmaptfloatR4(R=R>(R&(s/home/andreas/coglang/dopg.pytprob€s RB(R(R"R%R&RBt_[1]R=R>((R&s/home/andreas/coglang/dopg.pyRxs css‡‡fd†}ttƒ‰ttƒ‰x.tdtˆƒdƒD]}x tdtˆƒ|ƒD]|d‰x'ˆiD]}|ˆˆ|ƒˆ|¤s c3s5x.|]'}ˆˆ|fˆ|dˆfVqWdS(iN((RR>(tmaxcRDRE(s/home/andreas/coglang/dopg.pys §s (RtinttrangeR1RRRtmax(R"RFRItlengthR tktmax_xt best_split((RJRDR"RERKRFs/home/andreas/coglang/dopg.pytparse‹s(    *"(t__name__t __module__R*RRRRRS(((s/home/andreas/coglang/dopg.pyRs  %    cCsdidƒ}td„|Dƒddƒ}|iGHd}xA|o9dGtƒ}x%|ii|iƒƒD] }|GHqiWq<WdS( s a basic REPL for testing s(S (NP John) (VP (V likes) (NP Mary))) (S (NP Peter) (VP (V hates) (NP Susan))) (S (NP Harry) (VP eats (NP pizza))) (S (NP Hermione) (VP eats))s cssx|]}t|ƒVqWdS(N(R(RR ((s/home/andreas/coglang/dopg.pys ¹s R$Rsfoo!s sentence:N(RRR t raw_inputR!t nbest_parse(tcorpustdtwR(((s/home/andreas/coglang/dopg.pytmain®s t__main__Ntverboset optionflagss%d doctests succeeded!((t__doc__t collectionsRt itertoolsRRtnltkRRRRRRR RRR[RTtdoctestttestmodtFalsetNORMALIZE_WHITESPACEtELLIPSIStfailt attempted(((s/home/andreas/coglang/dopg.pyts" ž