Ñò ©­>Lc @sÖdZddklZddklZlZddklZddkl Z l Z l Z l Z dd d„ƒYZ edjoTdd kZeid ed eieiBƒ\ZZeoe o d eGHqÒnd S(s Shell interface to bitpar, an efficient chart parser for (P)CFGs. Expects bitpar to be compiled and available in the PATH. Currently only yields the one best parse tree without its probability. Todo: - yield n best parses with probabilites (parameter) - parse chart outputiÿÿÿÿ(t defaultdict(tPopentPIPE(tuuid1(tTreetProbabilisticTreetFreqDisttInsideChartParsertBitParChartParserc BsbeZd d d d d eddd„Zd„Zd„Zd„Zd„Zd d„Z d„Z RS( i tc Cs½||_||_||_||_|o ||_n tƒ|_||_||_||_||_ |o)|o"|i d|id|iƒn|pt dƒ‚n|i ƒdS(sN Interface to bitpar chart parser. Expects a list of weighted productions with frequencies (not probabilities). @param weightedrules: sequence of tuples with strings (lhs and rhs separated by tabs, eg. "S NP VP") and frequencies. The reason we use this format is that it is close to bitpar's file format; converting a weighted grammar with probabilities to frequencies would be a detour, and bitpar wants frequencies so it can do smoothing. @param lexicon: set of strings belonging to the lexicon (ie., the set of terminals) @param rootsymbol: starting symbol for the grammar @param unknownwords: a file with a list of open class POS tags with frequencies @param openclassdfsa: a deterministic finite state automaton, refer to the bitpar manpage. @param cleanup: boolean, when set to true the grammar files will be removed when the BitParChartParser object is deleted. @param name: filename of grammar files in case you want to export it, if not given will default to a unique identifier @param n: the n best parse trees will be requested >>> wrules = ( ("S\tNP\tVP", 1), ("NP\tmary", 1), ("VP\twalks", 1) ) >>> p = BitParChartParser(wrules, set(("mary","walks"))) >>> tree = p.parse("mary walks".split()) >>> print tree (S (NP mary) (VP walks)) (p=1.0) >>> from dopg import GoodmanDOP >>> d = GoodmanDOP([tree], parser=InsideChartParser) >>> d.parser.parse("mary walks".split()) ProbabilisticTree('S', [ProbabilisticTree('NP@1', ['mary']) (p=1.0), ProbabilisticTree('VP@2', ['walks']) (p=1.0)]) (p=0.444444444444) >>> d.parser.nbest_parse("mary walks".split(), 10) [ProbabilisticTree('S', [ProbabilisticTree('NP@1', ['mary']) (p=1.0), ProbabilisticTree('VP@2', ['walks']) (p=1.0)]) (p=0.444444444444), ProbabilisticTree('S', [ProbabilisticTree('NP', ['mary']) (p=1.0), ProbabilisticTree('VP@2', ['walks']) (p=1.0)]) (p=0.222222222222), ProbabilisticTree('S', [ProbabilisticTree('NP@1', ['mary']) (p=1.0), ProbabilisticTree('VP', ['walks']) (p=1.0)]) (p=0.222222222222), ProbabilisticTree('S', [ProbabilisticTree('NP', ['mary']) (p=1.0), ProbabilisticTree('VP', ['walks']) (p=1.0)]) (p=0.111111111111)] >>> d = GoodmanDOP([tree], parser=BitParChartParser) writing grammar >>> d.parser.parse("mary walks".split()) ProbabilisticTree('S', [Tree('NP@1', ['mary']), Tree('VP@2', ['walks'])]) (p=0.444444) >>> list(d.parser.nbest_parse("mary walks".split())) [ProbabilisticTree('S', [Tree('NP@1', ['mary']), Tree('VP@2', ['walks'])]) (p=0.444444), ProbabilisticTree('S', [Tree('NP', ['mary']), Tree('VP@2', ['walks'])]) (p=0.222222), ProbabilisticTree('S', [Tree('NP@1', ['mary']), Tree('VP', ['walks'])]) (p=0.222222), ProbabilisticTree('S', [Tree('NP', ['mary']), Tree('VP', ['walks'])]) (p=0.111111)] TODO: parse bitpar's chart output / parse forest s /tmp/g%s.pcfgs /tmp/g%s.lexsneed grammar or file nameN( tgrammartlexicont rootsymboltnametidRtcleanuptnt unknownwordst openclassdfsat writegrammart ValueErrortstart( tselft weightedrulesR R RRRRR ((s0/home/andreas/sslp/dop-transformations/bitpar.pyt__init__s @          "cCsBd|i|if}|iot|iƒƒn|iƒdS(Nsrm /tmp/g%s.pcfg /tmp/g%s.lex(RRRtsplittstop(Rtcmd((s0/home/andreas/sslp/dop-transformations/bitpar.pyt__del__^s cCsöd|i|_|io|id|i7_n|io|id|i7_n|io|id|i7_n|io#|id|i|if7_n |id|i|if7_t|iiƒdt dt dt ƒ|_ dS( Nsbitpar -q -b %d -vp -p s-s %s s-u %s s-w %s s/tmp/g%s.pcfg /tmp/g%s.lextstdintstdouttstderr( RRR RRR RRRRtbitpar(R((s0/home/andreas/sslp/dop-transformations/bitpar.pyRcs    #cCs.t|iiƒtƒp|iiƒndS(N(t isinstanceR tpolltintt terminate(R((s0/home/andreas/sslp/dop-transformations/bitpar.pyRsscCsFt|iiƒtƒo|iƒny)|iiddi|ƒƒ\}}WnX|iƒ|iiiƒGH|ii iƒGH|iiddi|ƒƒ\}}nXd|jo&t d|i ƒ|i ƒfƒ‚n|i ddƒd|i ddƒd}}t |i dƒdƒ}t|ƒ}t|i|d|ƒS( Nu%s s t=u"no output. stdout: %s stderr: %s iiitprob(R!R R"R#Rt communicatetjoinRtreadRRtstripRtfloatRRtnode(RtsenttresultRR&ttree((s0/home/andreas/sslp/dop-transformations/bitpar.pytparsews) ) &- cCs­t|iiƒtƒo|iƒn|iiddi|ƒƒ\}}|iƒd }d„|ddd…Dƒ}d„|ddd…Dƒ}d „t||ƒDƒS( s¶ n has to be specified in the constructor because it is specified as a command line parameter to bitpar, allowing it here would require potentially expensive restarts of bitpar. u%s s iÿÿÿÿcss=x6|]/}d|jot|idƒdƒVqqWdS(R%iN(R+R(t.0ta((s0/home/andreas/sslp/dop-transformations/bitpar.pys s Nicssx|]}t|ƒVqWdS(N(R(R1R2((s0/home/andreas/sslp/dop-transformations/bitpar.pys ‘s icss1x*|]#\}}t|i|d|ƒVqWdS(R&N(RR,(R1R2tb((s0/home/andreas/sslp/dop-transformations/bitpar.pys ’s ( R!R R"R#RR'R(t splitlinestzip(RR-tn_will_be_ignoredR.Rtresultstprobsttrees((s0/home/andreas/sslp/dop-transformations/bitpar.pyt nbest_parse‰s%cst|dƒt|dƒ}}ttƒ‰ttƒ‰‡‡fd†}|i|ƒƒd„}|i|ˆƒƒ|iƒ|iƒdS(sŒ write a grammar to files f and l in a format that bitpar understands. f will contain the grammar rules, l the lexicon with pos tags. twc3s»x´ˆiD]©\}}|iddƒd|idƒd}}|dˆijoˆ|di|ƒq t|ƒdjpdd„|Dƒjoq q dt|ƒ|fVq WdS(Ns iiR css%x|]}t|ƒiƒVqWdS(N(tstrR*(R1R2((s0/home/andreas/sslp/dop-transformations/bitpar.pys £s u%s %s (R RR tinctlentrepr(truletfreqtlhstrhs(tlexR(s0/home/andreas/sslp/dop-transformations/bitpar.pytprocess›s **cssIxB|iƒD]4\}}d|did„|iƒDƒƒfVq WdS(Nu%s %s s css@x9|]2}|diƒoditt|ƒƒVqqWdS(it N(R*R(tmapR<(R1R2((s0/home/andreas/sslp/dop-transformations/bitpar.pys °s (titemsR((RDtwordttags((s0/home/andreas/sslp/dop-transformations/bitpar.pytproc¬s N(topenRtlistRt writelinestclose(RtftlRERK((RRDs0/home/andreas/sslp/dop-transformations/bitpar.pyR”s    N( t__name__t __module__tNonetTrueRRRRR0R:R(((s0/home/andreas/sslp/dop-transformations/bitpar.pyR s!P     t__main__Ntverboset optionflagss%d doctests succeeded!((t__doc__t collectionsRt subprocessRRtuuidRtnltkRRRRRRRtdoctestttestmodtFalsetNORMALIZE_WHITESPACEtELLIPSIStfailt attempted(((s0/home/andreas/sslp/dop-transformations/bitpar.pyts"¨