61A Lecture 37Friday, December 2What is Computer Science?SystemsArtificial IntelligenceGraphicsSecurityNetworkingProgramming Languages...2Computer VisionPlanningRoboticsNatural Language Processing...Machine Translation3I will do it laterTarget languageParallel corpus gives translation examplesYo lo haré de muy buen gradoI will do it gladlyDespués lo verasYou will see laterMachine translation system:Model of translationTarget language corpus gives examples of well-formed sentencesI will get to it laterSee you laterHe will do itYo lo haré despuésNOVEL SENTENCESource languageThe Syntactic Structure of Natural Language4VBMD VPVPNPSPRP ADVYo lo haré de muy buen gradoI will do it gladlyDespués lo verasYou will see laterPRPVBMD VPVPNPSPRPADVI will do it laterModel of translationYo lo haré despuésMachine translation system:SSADVADVParallel corpus gives translation examplesA Translation System in 20 MinutesContext-free grammars as a model of language generationLarge-scale linguistic annotationsTree transformations5English Yoda-speakHelp you, I can! Yes! Mm!When 900 years old you reach, look as good, you will not. Hm.A Context-Free Grammar Describes Generation6 S -> NP VPNP -> PRPPRP!NP -> IVP -> VBVP -> VB PRPPRP -> you VB -> know VB -> help"Grammar""Lexicon"SNP VPPRP VB PRPI know youGrammar refinement!VPPRP!VP -> mePRP -> I!NP!VPA Context-Free Grammar Describes Generation7 S -> NP VPNP -> PRPPRP -> IVP -> VBVP -> VB PRPPRP -> youVP -> MD VP VB -> know VB -> help MD -> can"Grammar""Lexicon"SNP VPPRPIA grammar can be learned from data (demo)canMDVPVB PRPhelp youLeft cornersLeft-Corner Parsing Builds Trees For Sentences8 S -> NP VPNP -> PRPPRP -> IVP -> VBVP -> VB PRPPRP -> you VB -> know VB -> help"Grammar""Lexicon"Siknow youNPPRPVBcomplete(VP, (VP (VB know)), 2)VPparse_next(S, 1)complete(S, (PRP i), 1)complete(S, (NP (PRP i)), 1)parse_next(VP, 2)complete(VP, (VB know), 2)complete(S, (S ...), 1)Left-Corner Parsing Builds Trees For Sentences9 S -> NP VPNP -> PRPPRP -> IVP -> VBVP -> VB PRPPRP -> you VB -> know VB -> help"Grammar""Lexicon"SNPPRPVBiknow youVPPRPLeft cornerscomplete(VP, (VP (VB know) (PRP you)), 2)parse_next(S, 1)complete(S, (PRP i), 1)complete(S, (NP (PRP i)), 1)parse_next(VP, 2)complete(VP, (VB know), 2)complete(S, (S ...),
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