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Idiom Savant at Semeval-2017 Task 7: Detection and Interpretation of English Puns

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Idiom Savant at Semeval-2017 Task 7: Detection and Interpretation of English Puns Idiom Savant at Semeval-2017 Task 7: Detection and Interpretation of English Puns Samuel Doogan Aniruddha Ghosh Hanyang Chen Tony Veale Department of Computer Science and Informatics University College Dublin Dublin, Ireland samuel.doogan, aniruddha.ghosh, hanyang.chen @ucdconnect.ie { [email protected] } Abstract punning effect is being driven. In a written context, puns are classified into 2 This paper describes our system, entitled categories. Homographic puns shown in exam- Idiom Savant, for the 7th Task of the Se- ple1, exploits polysemy of the language by us- meval 2017 workshop, “Detection and in- ing a word or phrase which has multiple coher- terpretation of English Puns”. Our system ent meanings given its context; And heterographic consists of two probabilistic models for puns shown in example2, humorous effect is often each type of puns using Google n-grams induced by adding incongruity by replacing a pho- and Word2Vec. Our system achieved f- netically similar word which is semantically dis- score of 0.84, 0.663, and 0.07 in ho- tant from the context. mographic puns and 0.8439, 0.6631, and 0.0806 in heterographic puns in task 1, (1) Tires are fixed for a flat rate. task 2, and task 3 respectively. (2) A dentist hates having a bad day at the 1 Introduction orifice. A pun is a form of wordplay, which is often pro- The rest of the paper is organized as fol- filed by exploiting polysemy of a word or by lows. Section2 give a general description of replacing a phonetically similar sounding word our approach. Section3 and4 illustrate the de- for an intended humorous effect. From Shake- tailed methodologies used for detecting and locat- speare’s works to modern advertisement catch- ing Heterographic and Homographic puns respec- phrases (Tanaka, 1992), puns have been widely tively. In section5, we provided an analysis of the used as a humorous and rhetorical device. For system along with experimental results and finally a polysemous word, the non-literal meaning is section6 contains some closing remarks and con- addressed when contextual information has low clusion. accordance with it’s primary or most prominent meaning (Giora, 1997). A pun can be seen as a 2 General Approach democratic form of literal and non-literal meaning. We argue that the detection of heterographic puns In using puns, the author alternates an idiomatic rests on two assumptions. Firstly, the word be- expression to a certain extent or provides enough ing used to introduce the punning effect is pho- context for a polysemous word to evoke non-literal netically similar to the intended word, so that the meaning without attenuating literal meaning com- reader can infer the desired meaning behind the pletely (Giora, 2002). pun. Secondly, the context in which the pun takes Task 7 of the 2017 SemEval workshop (Miller place is a subversion of frequent or idiomatic lan- et al., 2017) involves three subtasks. The first sub- guage, once again so that the inference appropri- task requires the system to classify a given context ately facilitated. This introduces two computa- into two binary categories: puns and non-puns. tional tasks - designing a model which ranks pairs The second subtask concerns itself with finding of words based on their phonetic similarity, and in- the word producing the punning effect in a given troducing a means by which we can determine the context. The third and final subtask involves an- normativeness of the context in question. The sys- notating puns with the dual senses with which the 103 Proceedings of the 11th International Workshop on Semantic Evaluations (SemEval-2017), pages 103–108, Vancouver, Canada, August 3 - 4, 2017. c 2017 Association for Computational Linguistics tem is attempting to recreate how a human mind From the general description of different types might recognize a pun. Take this example: of puns, it is evident that detection of pun is com- plex and challenging. To keep the complexity at (3) “Acupuncture is a jab well done” its minimum, Idiom Savant contains two distinct It is immediately noticeable that this sentence is models to handle homographic and heterographic not a normative use of language. However, we pun tasks. can easily recognize the familiar idiom “a job well 3 Heterographic Puns done”, and it is easy to make this substitution due to the phonetic overlap between the words “job” Idiom Savant calculates scores for all possible and “jab”. Our system is therefore trying to mimic ngram pairs for a given context. To generate pairs, two things: the detection of an infrequent (or even the system first separates the context into n-grams. semantically incoherent) use of language, and the For each of these original n-grams, the corpus is detection of the intended idiom by means of pho- searched for n-grams that are at most one word netic substitution. To model the detection of sub- different. The pairs are then scored using the met- verted uses of idioms, we use the Google n-gram ric described below. The scores for these pairs are corpus (Brants and Franz, 2006). We assume that then used to tackle each subtask, which is covered the normativeness of a context is represented by below. Since heterographic puns are fabricated by the n-gram frequency provided by this corpus. The replacing phonetically similar words, classifica- system then replaces phonetically similar words in tion and identification requires a phonetic knowl- the non-normative context in an attempt to pro- edge of the language. To obtain phonetic represen- duce an idiomatic use of language. We determine tation of a word, CMU pronouncing dictionary1 an idiomatic use of language to be one that has an was used. We have ignored the lexical stresses in adequately high frequency in the Google n-gram the pronunciation, as experimentation showed that corpus. We argue that if, by replacing a word coarser definitions led to better results. To mea- in an infrequent use of language with a phonet- sure the phonetic distance between a phoneme rep- ically similar word, we arrive at a very frequent resentation of a pair of words, we have employed use of language, we have derived an indicator for three different strategies which use Levenshtein the usage of puns. For example, the quadgram distances. The first distance formula, dph, calcu- “a jab well done” occurs 890 times in the cor- lates Levenshtein distance between two words by pus. By replacing the word “jab” with “job”, the considering each CMU phoneme of a word as a new quadgram occurs 203575 times. This increase single unit. Take the pun word and intended word in frequency suggests that a pun is taking place. from example 2: The system uses several methods to examine such changes in frequency, and outputs a “score”, or the d ( AO, F, AH, S , AO, R, AH, F, AH, S ) = 2 estimated likelihood that a pun is being used. The ph { } { } way in which these scores are computed is detailed Our second strategy treats the phonetic repre- below. sentation as a concatenated string and calculates Homographic puns are generally figurative in Levenshtein distance d . nature. Due to identical spelling, interpretation of phs literal and non-literal meaning is solely dependent on the context information. Literal and non-literal dphs(“AOFAHS”, “AORAHFAHS”) = 3 meaning of a polysemous word are referred by dif- ferent slices of context, which is termed as “double With this metric, the distance reflects the simi- grounding” by Feyaerts and Broneˆ (2002). Con- larity between phonemes such as “AH” and “AA”, sidering example1, it is easily noticeable that two which begin with the same vowel sounds. The fall- coherent meanings of ‘flat’, ‘a deflated pneumatic back method for out-of-vocabulary words uses the tire’ and ‘commercially inactive’, have been re- original Levenshtein string distance. ferred by ‘Tires’ and ‘rate’ respectively. Thus de- tection of homographic puns involves establish- dch(“office”, “orifice”) = 2 ing links between concepts present in context with 1http://www.speech.cs.cmu.edu/cgi-bin/ meanings of polysemous word. cmudict 104 The system normalizes these distances with re- 3.2 Locating Pun Word spect to the length of the phonetic representation By maximizing the score when replacing all po- of the target words to reduce the penalty caused tential lexical units, the system also produces a by word length. By converting distance measures candidate word. Whichever replacement word into similarity ratios, longer words remain candi- used to produce the top n-gram pair is returned as dates for possible puns, even though Levenshtein the candidate word. The system only examines the distances will be greater than the shorter counter- last two ngrams. Those grams, the system anno- parts. The system chooses the maximum positive tates the POS tag and only the content words — ratio from all possible phonetic representations. nouns, verbs, adverbs and adjectives— are con- If no positive ratio exists, the target word is dis- sidered as candidate words. The system uses a fall carded as a possible candidate. back by choosing the last word in the context when min w f df (w1,w2) w w1,w2 || || − no adequate substitution is found. ratiof (w1, w2) = ∈ min w f w w ,w ∈ 1 2 || || wheref ph, phs, ch 3.3 Annotating senses for pun meanings ∈ { } Subtask 3 introduces an added difficulty with re- gards to heterographic puns. The system needs to ratio = max(ratioph, ratiophs, ratioch) correctly identify the two senses involved of pun, which is based on the accuracy of selecting tar- We choose the maximum ratio in order to min- get words. The system produce a ranked list of imize the drawbacks inherent in each metric.
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