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Noun Generation for Nominalization in Academic Writing

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Noun Generation for Nominalization in Academic Writing Noun Generation for Nominalization in Academic Writing Dariush Saberi, John Lee Department of Linguistics and Translation City University of Hong Kong [email protected], [email protected] Abstract Previous studies on automatic manipulation of clausal structure have mostly concentrated on Nominalization is a common technique in aca- syntactic simplification, typically by splitting a demic writing for producing abstract and for- mal text. Since it often involves paraphras- complex sentence into two or more simple sen- ing a clause with a verb or adjectival phrase tences (Siddharthan, 2002; Alu´ısio et al., 2008; into a noun phrase, an important task is to Narayan and Gardent, 2014). More recent re- generate the noun to replace the original verb search has also attempted semi-automatic nomi- or adjective. Given that a verb or adjective nalization (Lee et al., 2018), which aims to para- may have multiple nominalized forms with phrase a complex clause into a simplex clause by similar meaning, the system needs to be able transforming verb or adjectival phrases into noun to automatically select the most appropriate one. We propose an unsupervised algorithm phrases. that makes the selection with BERT, a state- Noun generation is a core task in the nom- of-the-art neural language model. Experimen- inalization pipeline (Table2). Resources such tal results show that it significantly outper- as NOMLEX (Meyers et al., 1998) and CAT- forms baselines based on word frequencies, VAR (Habash and Dorr, 2003) have greatly facili- word2vec and doc2vec. tated this task by providing lists of related nouns, 1 Introduction verbs and adjectives. However, straightforward look-up in these lists does not suffice since a word Automatic paraphrasing — re-writing a sentence may have multiple nominalized forms with similar while preserving its original meaning — has re- meaning. For example, the verb “dominate” can ceived much interest in the computational linguis- be transformed into “domination”, “dominance”, tics community in recent years. One type of “dominion”, as well as the gerund form “dom- paraphrasing is lexical substitution (McCarthy and inating”. We will henceforth refer to these as Navigli, 2009), which replaces a word or short the “noun candidates”. As shown in Table1, phrase with another. Paraphrasing can also in- in the context of the clause “The British dom- volve manipulation of the clausal structure of a inated India”, “domination” would be preferred sentence, with a range of options that has been (i.e., “British domination of India”); in the context described as the “cline of metaphoricity” (Hall- of the clause “older people dominated this neigh- iday and Matthiessen, 2014). Towards one end borhood”, “dominance” would be more appropri- of this cline, the text offers a “congruent con- ate (i.e., “The dominance of older people in this strual of experience”, and the sentences tend to neighborhood”). be clausally complex but lexically simple (e.g., The goal of this paper is to evaluate a noun gen- the complex clause “Because she didn’t know eration algorithm that selects the best noun candi- the rules, she died”1). Towards the other end date during nominalization. The approach taken of the cline, the text exhibits a “metaphorical re- by Lee et al. (2018), which considers noun fre- construal”, and the sentences are clausally simpler quency statistics alone, always selects the same and lexically denser (e.g., the nominal group “Her noun regardless of the sentential context. We use death through ignorance of the rules”). instead a neural language model, BERT, for noun 1This example and the next are both taken from Halliday generation. Experimental results show that it sig- and Matthiessen (2014). nificantly outperforms baselines based on word Verb-to-noun mapping Example sentence Nominalized version dominate ! The British dominated India ... British domination of India ... fdominance, Older people dominated this The dominance of older people domination, ...g neighborhood ... in this neighborhood ... move ! They moved northward ... Their move northward ... fmotion, move, ...g The particle moved irregularly ... The irregular motion of the particle ... enter ! The clown entered the stage ... The clown’s entrance to the stage ... fentrance, entry, ...g The immigrants entered the The entry of the immigrants into country ... the country ... measure ! fmeasure, Success is measured ... The measure of success ... measurement, ...g Blood pressure is measured ... The measurement of blood pressure ... Table 1: Example verb-to-noun mappings with multiple noun candidates (left column), illustrated by sentences with the same verb (middle column) requiring different target nouns (right column) in their nominalized version. frequencies, word2vec and doc2vec. would require “succession” (“He succeeded to the The rest of the paper is organized as follows. throne ...” ! “His succession to the throne ...”). Following a review of previous work (Section2), WSD is not necessary for noun generation when we give details on our dataset (Section3) and out- the verb corresponds to a noun with the same line our approach (Section4). We then report ex- range of meanings. Consider the verb “conclude”, perimental results (Section5) and conclude. which may mean either “to finish” or “to reach agreement”. Nominalization requires no WSD 2 Previous work since the noun “conclusion” preserves the same semantic ambiguity. We first discuss the relation between our task and lexical substitution (Section 2.1) and word sense In other cases, our task requires fine-grained disambiguation (Section 2.2). We then describe WSD, especially when the noun candidates are se- an existing nominalization system (Section 2.3), mantically close. Their differences can be rather whose noun generation algorithm will serve as our nuanced (e.g., “domination” vs. “dominance”), baseline. making it challenging for typical WSD models to distinguish. 2.1 Relation to lexical substitution 2.3 Nominalization pipeline Noun generation in nominalization can be con- sidered a specialized kind of lexical substitution. In the first reported tool for semi-automatic nom- While lexical substitution typically aims for a inalization aimed at academic writing (Lee et al., paraphrase in the same part-of-speech (POS) (e.g., 2018), the system first parses the input clause to “dominate” ! “prevail”), our task by definition detect the potential for nominalization. If its de- involves a change in POS, usually from a verb or pendency tree exhibits an expected structure (e.g., adjective to a noun (e.g., “dominate” ! “domi- Table2(i)), the system proceeds to lexical map- nation”). This difference is reflected in the lim- ping (Table2(ii)), which includes transforming ited number of verb-noun or adjective-noun en- the main verb (“entered”) to a noun (“entrance”); tries in open-source paraphrase corpora such as an adverb (“abruptly”) to an adjective (“abrupt”); PPDB (Ganitkevitch et al., 2013). and the subject (“the clown”) to a possessive form (“the clown’s” or “of the clown”) . Finally, the 2.2 Relation to word sense disambiguation system generates a sentence by choosing one of Word sense disambiguation (WSD) is relevant to the possible surface realizations through heuristics noun generation to the extent that verb senses can (Table2(iii)). guide the choice of noun candidates. For exam- The noun generation task in lexical mapping ple, “succeed” in the sense of “achieve the desired utilizes verb-to-noun and adjective-to-noun map- result” should be paraphrased as “success” (“He pings, some examples of which are shown in Ta- succeeded in ...” ! “His success in ...”), whereas ble1. The system constructed these mappings on “succeed” in the sense of “take over a position” the basis of NOMLEX (Meyers et al., 1998) and (i) Parsing nsubj advmod obj The clown abruptly entered the stage (ii) Lexical the clown abruptly entered the stage mapping #### the clown’s abrupt entrance to the stage (iii) Sentence The abrupt entrance of the clown to the stage ... generation The clown’s abrupt entrance to the stage ... His abrupt entrance to the stage ... Table 2: The nominalization pipeline (Lee et al., 2018): (i) syntactic parsing; (ii) lexical mapping, including noun generation (bolded), which is the focus of this paper; and (iii) sentence generation. CATVAR (Habash and Dorr, 2003)2, with a to- put sentence. To make our dataset as realistic as tal of 7,879 verb-to-noun mappings, and 11,369 possible, we required sentences to have one of the adjective-noun mappings. three common nominalized forms, corresponding to the three surface forms shown in Table2(iii): 3 Dataset • “the <target noun> of <subject> ...” Among the mappings described in Section 2.3, there were 7,380 verb-to-noun and 5,339 • “<subject>’s <target noun> ...” adjective-to-noun mappings with at least two • “<poss> <target noun> ...” noun candidates. We constructed our dataset on the basis of these mappings only, because the where <target noun> is the gold noun candidate, others do not require selection from multiple <poss> is a possessive pronoun and <subject> is candidates. the noun subject of the hypothetical input sentence The ideal dataset for this research would con- before nominalization. In addition, we require the sist of input sentences containing these verbs and target noun, verb and adjective to be tagged as adjectives; and, as gold output, the noun candi- such at least two times in the Brown Corpus (Fran- date selected for use in the nominalized version cis and Kuceraˇ , 1979),
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