compositional semantics ppt

/A << /S /GoTo /D (Navigation2) >> 70 0 obj << /Rect [301.994 0.996 308.967 10.461] /Subtype /Link presupposes Emily has been to … 66 0 obj << It is rooted within the tradition of model theoretic semantics, and develops an explicit fragment of both the syntax and semantics of a rich portion of English. /ColorSpace 3 0 R /Pattern 2 0 R /ExtGState 1 0 R See our User Agreement and Privacy Policy. /Subtype /Link /Length 1094 /Type /Annot /A << /S /GoTo /D (Navigation3) >> 60 0 obj << It deals with the meaning of words (lexical semantics) ... dog: 4-legged mammal, hairy, canine, definitely loyal. We de ne a log-linear dis-tribution over DCS logical forms and estimate the parameters using a simple procedure that alternates between beam search and numerical optimization. /Rect [259.927 0.996 266.901 10.461] >> endobj >> endobj Build MR recursively bottom-up from the parse tree. What does TRUTH-CONDITIONAL SEMANTICS mean? /Subtype /Link 63 0 obj << /Rect [297.012 0.996 303.986 10.461] /Border[0 0 0]/H/N/C[.5 .5 .5] /Border[0 0 0]/H/N/C[1 0 0] /Rect [7.508 259.067 121.19 266.714] /Border[0 0 0]/H/N/C[.5 .5 .5] Peter has quit smoking. /Type /Annot August 2014. /Type /Annot - ppt video online download >> /Subtype /Link understand a sentence he/she hears for the ﬁrst time. 56 0 obj << /A << /S /GoTo /D (Navigation1) >> /Rect [285.942 0.996 292.916 10.461] >> endobj The Principle of Semantic Compositionality (sometimes called ‘Frege's Principle’) is the principle that the meaning of a (syntactically complex) whole is a function only of the meanings of its (syntactic) parts together with the manner in which these parts were combined. /Type /Annot /D [43 0 R /XYZ -28.346 0 null] /Border[0 0 0]/H/N/C[.5 .5 .5] I Two basic types: I e is the type for entities in the model (such as k) I t is the type for truth values (i.e., either ‘true’ or ‘false’) Lexical Semantics vs. Compositional Semantics. So, for semantics, there must also be ﬁnite means for specifying the meanings of the inﬁnite set of sentences of any natural language. /Subtype/Link/A<> /Type /Annot >> endobj The principle of compositionality states that in a meaningful sentence, if the lexical parts are taken out of the sentence, what remains will be the rules of composition. develop a new semantic formalism, dependency-based compositional semantics (DCS), which has favorable linguistic, statistical, and computational properties. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. /Border[0 0 0]/H/N/C[.5 .5 .5] /A << /S /GoTo /D (Navigation2) >> Important variants of the compositionality principle will be presentedbelow in a form most similar to (C) to facilitate comparisons. 51 0 obj << Emily never went to Philadelphia again. semantics to be compositional, or at least as compositional as possible. Looks like you’ve clipped this slide to already. /Type /Annot /Type /Annot 54 0 obj << /Border[0 0 0]/H/N/C[.5 .5 .5] For this reason se-mantic rules must be sensitive to syntactic structure. 1.6 Syntax and Semantics As the ambiguous examples above made clear, syntax aﬀects interpretation because syntactic ambiguity leads to semantic ambiguity. We define a compositional semantics for conditional term rewriting systems which we show to be rich enough to capture computational properties related to the use of logical variables. The following can serve as a common referencepoint: 1. COMPOSITIONAL. /Border[0 0 0]/H/N/C[.5 .5 .5] /Rect [239.891 0.996 249.853 10.461] ³ \dè3m´`\¦3-ã¼ _–I)áVÂ. 59 0 obj << /A << /S /GoTo /D (Navigation1) >> Price: £27.49. 43 0 obj << >> endobj 71 0 obj << /Rect [290.923 0.996 297.897 10.461] /Rect [233.913 0.996 241.883 10.461] Lexical vs. Compositional Semantics LEXICAL man: 2-legged mammal, (relatively) hairless, male sex, dog: 4-legged mammal, hairy, canine, definitely loyal COMPOSITIONAL Dog bites man. /A << /S /GoTo /D (Navigation1) >> Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. /A << /S /GoTo /D (Navigation1) >> L100: Lecture 7, Compositional semantics Typing in compositional semantics Typing I Semantic typing ensures that semantic expressions are consistent. 64 0 obj << >> endobj Digital Interactive PowerPoint presentation. /Subtype /Link If you continue browsing the site, you agree to the use of cookies on this website. This book provides an introduction to compositional semantics and to the syntax/semantics interface. 45 0 obj << /Subtype /Link 65 0 obj << We present a new notation for a sentential theory, and a unification grammar that builds logical forms in our notation. xÚÕXKoã6¾ûWğV¨Y>DŠì±Åv�EŠ"‰oÛ=¸²â°$Çìößw†IYV“Í£i²Àšâpæã¼I†‘5aäã„ F#‡ñ(ŒH-¨‘Šˆ\P.4Ù•äfry&ô¿�”+Òı(¡ÈnM†¤«1)mH÷cŒ:¡\¡Ğ|N„Ì¨e–Hš™œõä�LÎ¸É$�¤5Š|%(b¨ĞÃhnsÆNš\J"€‰3…~½&“K”2é~læu;¡€n€—QÿĞÆÌZkH HHqÜ�À#©‚Qå†pMİj’ãÆQxO00õ½nûqœÑ{œ2°’=İqšÚ\Z´��9-§T4@Ê`ä`O H*:å9ÇO.ÆH°)NŠónf¨f.D�»„àOàw¾‚!qdön›$Ò+ÄøİEÊÔæ¹†™uúa±ÎóÑ«�ô¶]˜L1�)¼Æl`.RÎ{hÏŞ´O@ñ> /Subtype/Link/A<> /A << /S /GoTo /D (Navigation1) >> Click on the correct answer to progress to the next slide. Definition of Compose( arg1, arg2 ) Compose( arg1, arg2 ) = For C OMPO MC: if (arg1 is a negator) then ¬ Polarity( arg2 ) (COMPOsition with Majority Class) else if (Polarity( arg1 ) == Polarity( arg2 )) then Polarity( arg1 ) else the majority polarity of data Compose( arg1, arg2 ) = For C OMPO PR: if (arg1 is a negator) then ¬ Polarity( arg2 ) (COMPOsition with PRiority) else Polarity( arg1 ) Table 2: Compositional inference rules motivated by compositional semantics. See our Privacy Policy and User Agreement for details. /Subtype /Link endobj The dog chased the cat ≠ The cat chased the dog. The problem is that a compositional semantics cannot easily build the logical forms that the theory requires. /Type /Annot 53 0 obj << /Subtype/Link/A<> >> endobj In the syntax lectures, we used the example of a desk calculator, where the semantics of complex expressions can be calculated recursively from the semantics of simpler ones. f Compositional Semantics. /Subtype /Link 48 0 obj << 69 0 obj << /Border[0 0 0]/H/N/C[.5 .5 .5] The dominant paradigm in compositional se-mantics is Montague semantics, which constructs lambda calculus forms in a bottom-up manner. /Type /Annot This means that given a surface structure and a lexicon, the semantics allows us to determine the truth-conditions of the structure. /A << /S /GoTo /D (Navigation1) >> /Rect [275.979 0.996 282.953 10.461] /Rect [264.909 0.996 271.883 10.461] /Rect [269.89 0.996 276.864 10.461] /ProcSet [ /PDF /Text ] 61 0 obj << It deals with the meaning of words (Lexical semantics) and how meaning of sentences (compositional semantics) is derived from words. /Type /Annot /Rect [346.052 0.996 354.022 10.461] Once the meaningful lexical items are taken away—"Socrates" and "man"—what is left is the pseudo-sentence, "S was a M". /Subtype /Link Generating Speech Recognition Grammars with Compositional Semantics from Unification Grammars ... Introduce a generic compositional semantics in state-of-the ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: e4554-ZDc1Z SEMANTICS Written by : Rachmad Azari 113.11.053 STATE INSTITUTE FOR ISLAMIC STUDIES (STAIN) SALATIGA 2. /Rect [254.946 0.996 261.92 10.461] >> endobj So we use certain words with very speciﬁc technical senses, and we use fonts to convey information. Compositional Semantics So now we have meanings for the words How do we know how to combine words? >> endobj Dog bites man. >> endobj Metalanguages and Notational Conventions We use language to talk about language, which can get messy. Area : The major areas of compositional semantics are anomalies, idioms, ambiguities, and presuppositions. the sum of the individual lexemes. /MediaBox [0 0 362.835 272.126] α(x) ∧β(x) →VP : α and : ∅ VP : β (intersection) Example: S NP VP Bob VP and sings VP dances bob λy.sings(y) λz.dances(z) Build Sentences using Colourful Semantics to say what the people are doing in each leisure time activity. presupposes Peter smoked before. /A << /S /GoTo /D (Navigation1) >> /Contents 67 0 R The study of semantics includes the study of how meaning is constructed, interpreted, clarified, obscured, illustrated, simplified negotiated, contradicted and paraphrased. /Resources 66 0 R ie, the whole does not equal the sum of the parts. CCG is one instantiation (Steedman, 2000), which is used by many semantic parsers, e.g., Zettlemoyer and Collins (2005). The dog chased the cat = The cat was chased … Pauline Jacobson. ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 2233d-NWE2N 3 Key word sentences using “Who?” “is doing?” and “what?” questions to build the sentences. /Type /Annot formalisms, its semantics is compositional by design and is strongly typed, with semantic rules in one-to-one correspondence with the meaning-affecting rules of a Marcus parser. /Subtype/Link/A<> /Subtype /Link /Subtype /Link 55 0 obj << combine to form the meaning of larger units. Compositional Semantics • Compositional semantics: to account for speakers’ knowledge of truth, entailment, and ambiguity, we must assume that grammar contains semantic rules for how to combine the meanings of words into meaningful phrases and sentences – The principle of … /Type /Annot >> endobj NL MR Training Exs Semantic-Parser Learner Natural Language Meaning Rep Semantic Parser Compositional Semantics Approach to semantic analysis based on building up an MR compositionally based on the syntactic structure of a sentence. /Border[0 0 0]/H/N/C[.5 .5 .5] >> endobj /A << /S /GoTo /D (Navigation43) >> /Font << /F23 68 0 R >> The Principle of Compositionality: The meaning of an expression is a function of the meanings of its parts and of the way they are syntactically combined. /Type /Annot /D [43 0 R /XYZ -28.346 0 null] /Rect [318.045 0.996 329.004 10.461] The Montague semantic objects--functors and truth conditions--are replaced with elements of the frame language FRAIL. 52 0 obj << >> endobj /Rect [306.975 0.996 313.949 10.461] /Rect [280.96 0.996 287.934 10.461] /Type /Annot /Subtype /Link >> endobj >> endobj Take, for example, the sentence "Socrates was a man". stream /Border[0 0 0]/H/N/C[1 0 0] 448 pages Paperback 246x171mm In Stock. /Rect [339.078 0.996 348.045 10.461] >> endobj The general theory in compositional semantics: The meaning of a phrase is determined by combining the meanings of its subphrases, using rules which are driven by the syntactic structure. • The study of how meanings of small units. Semantics ppt 1. /Subtype /Link So, the semantics does not tell us what the truth-conditions of John hates Mary are in any direct way, but Lecture 21: Compositional Semantics Dan Klein – UC Berkeley Includes slides from Luke Zettlemoyer Truth-Conditional Semantics Linguistic expressions: ... Microsoft PowerPoint - SP10 cs288 lecture 21 -- compositional semantics.ppt [Compatibility Mode] … Compositional Semantics: Presupposition •A presupposes B when, to determine whether A is true or false, one must assume B is true. >> endobj Compositional Semantics. /Type /Annot A central principle of formal semantics is that the relation between syntax and semantics is compositional. /Annots [ 45 0 R 46 0 R 47 0 R 48 0 R 49 0 R 50 0 R 51 0 R 52 0 R 53 0 R 54 0 R 55 0 R 56 0 R 57 0 R 58 0 R 59 0 R 60 0 R 61 0 R 62 0 R 63 0 R 64 0 R 65 0 R ] Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. 107 0 obj << /Subtype /Link Nó‹Aš¹Åë7ÒGùáŞ¸—³ŞWr¼rH³wÒç:ë¿Ëípj„ö>¢@”^×xPY¦-2’„Ë There are many theses called ‘the principle ofcompositionality’. Most semantic theories Oxford Textbooks in Linguistics. /Border[0 0 0]/H/N/C[.5 .5 .5] >> endobj /Parent 72 0 R /Border[0 0 0]/H/N/C[.5 .5 .5] An Introduction to the Syntax/Semantics Interface. /Rect [352.03 0.996 360.996 10.461] >> endobj /Type /Annot 13. semantics (synonym, antonym, homonym, hyponym, polyseme, idioms), No public clipboards found for this slide. /Border[0 0 0]/H/N/C[.5 .5 .5] /Type /Page BASIC IDEAS IN SEMANTICS SEMANTICS is the study of MEANING in LANGUAGE. /Subtype /Link been on vocabulary, but contemporary semantics is increasingly concerned with the analysis of sentence meaning, or al least of those aspects of sentenced meaning that cannot be predicted from 4/25/12. /Rect [311.956 0.996 318.93 10.461] /Rect [327.012 0.996 339.963 10.461] compositional Semantics and Pragmatics 5. [1]When formulating more precise versions it is crucial to keep thepre-theoretical intuitions that led many to accept compositionalityfirmly … Collocation, fixed expression and idiom Semantic change and etymology Polysemy Homonymy, homophones and homographs Lexicology and lexicography Thesauruses, libraries and Web portals Epistemology >> endobj mined from the lexical and compositional semantics of a sentence represented in a given logic. We prove a theorem stating that any semantics can be encoded as a compositional semanties, which means that, essentially, the standard definition of compositionality is formally vacuous. >> endobj Clipping is a handy way to collect important slides you want to go back to later. /Subtype /Link /Filter /FlateDecode /Border[0 0 0]/H/N/C[.5 .5 .5] endstream /Subtype /Link 57 0 obj << Associate a combination rule with each grammar rule: S : β(α)→NP : α VP : β (function application) VP : λx . Nothing close to a complete compositional semantics for English is known; not least because nothing close to a complete meaning representation is known. /Border[0 0 0]/H/N/C[.5 .5 .5] /Type /Annot 4/25/12 /Type /Annot /A << /S /GoTo /D (Navigation1) >> >> endobj /Trans << /S /R >> However, the logical forms there can become quite complex, and in the context of >> endobj >> endobj /Type /Annot >> endobj http://www.theaudiopedia.com What is TRUTH-CONDITIONAL SEMANTICS? /A << /S /GoTo /D (Navigation43) >> /Border[0 0 0]/H/N/C[1 0 0] /A << /S /GoTo /D (Navigation2) >> œI��¥XUW™í /D [43 0 R /XYZ 28.346 232.151 null] 46 0 obj << You can change your ad preferences anytime. Lexical & Compositional Semantics – BROTHERFISH Lexical Semantics Chapter ppt video online download SEMANTICS (2) Dr. Ansa Hameed. The study of meaning in language. /A << /S /GoTo /D (Navigation3) >> /Type /Annot /A << /S /GoTo /D (Navigation1) >> /Border[0 0 0]/H/N/C[1 0 0] 62 0 obj << 58 0 obj << e.g., chase0(dog0(k)) is ill-formed. The grammar is implemented using the standard implementation of definite clause grammars in Prolog. /A << /S /GoTo /D (Navigation2) >> /Border[0 0 0]/H/N/C[.5 .5 .5] /Border[0 0 0]/H/N/C[.5 .5 .5] 50 0 obj << >> endobj 47 0 obj << • In generative grammar, a central principle of formal semantics is that the relation between syntax and semantics is compositional. /Border[0 0 0]/H/N/C[.5 .5 .5] /Rect [247.861 0.996 255.831 10.461] /Type /Annot /Border[0 0 0]/H/N/C[.5 .5 .5] Now customize the name of a clipboard to store your clips. 49 0 obj << (C)Themeaning of a complex expression is determined by its structure and themeanings of its constituents. ISBN: 9780199677153. If you continue browsing the site, you agree to the use of cookies on this website. Overview.