Assessing BERT’s ability to learn Italian syntax: a study on null-subject and agreement phenomena

The work presented in this paper investigates the ability of BERT neural language model pretrained in Italian to embed syntactic dependency relationships into its layers, by approximating a Dependency Parse Tree. To this end, a structural probe, namely a supervised model able to extract linguistic s...

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Vydané v:Journal of ambient intelligence and humanized computing Ročník 14; číslo 1; s. 289 - 303
Hlavní autori: Guarasci, Raffaele, Silvestri, Stefano, De Pietro, Giuseppe, Fujita, Hamido, Esposito, Massimo
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Berlin/Heidelberg Springer Berlin Heidelberg 01.01.2023
Springer Nature B.V
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ISSN:1868-5137, 1868-5145
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Abstract The work presented in this paper investigates the ability of BERT neural language model pretrained in Italian to embed syntactic dependency relationships into its layers, by approximating a Dependency Parse Tree. To this end, a structural probe, namely a supervised model able to extract linguistic structures from a language model, has been trained leveraging the contextual embeddings from the layers of BERT. An experimental assessment has been performed using an Italian version of BERT-base model and a set of datasets for Italian labelled with Universal Dependencies formalism. The results, achieved using standard metrics of dependency parsers, have shown that a knowledge of the Italian syntax is embedded in central-upper layers of the BERT model, according to what observed in literature for the English case. In addition, the probe has been also used to experimentally evaluate the BERT model behaviour in case of two specific syntactic phenomena in Italian, namely null-subject and subject-verb-agreement, showing better performance than an Italian state-of-the-art parser. These findings can open a path for the development of new hybrid approaches, exploiting the probe to integrate or improve limits or weaknesses in analysing articulated constructions of Italian syntax, traditionally complex to be parsed.
AbstractList The work presented in this paper investigates the ability of BERT neural language model pretrained in Italian to embed syntactic dependency relationships into its layers, by approximating a Dependency Parse Tree. To this end, a structural probe, namely a supervised model able to extract linguistic structures from a language model, has been trained leveraging the contextual embeddings from the layers of BERT. An experimental assessment has been performed using an Italian version of BERT-base model and a set of datasets for Italian labelled with Universal Dependencies formalism. The results, achieved using standard metrics of dependency parsers, have shown that a knowledge of the Italian syntax is embedded in central-upper layers of the BERT model, according to what observed in literature for the English case. In addition, the probe has been also used to experimentally evaluate the BERT model behaviour in case of two specific syntactic phenomena in Italian, namely null-subject and subject-verb-agreement, showing better performance than an Italian state-of-the-art parser. These findings can open a path for the development of new hybrid approaches, exploiting the probe to integrate or improve limits or weaknesses in analysing articulated constructions of Italian syntax, traditionally complex to be parsed.
Author Silvestri, Stefano
Guarasci, Raffaele
Fujita, Hamido
De Pietro, Giuseppe
Esposito, Massimo
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Keywords Neural language model
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Syntactic phenomena
Dependency parse tree
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Snippet The work presented in this paper investigates the ability of BERT neural language model pretrained in Italian to embed syntactic dependency relationships into...
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SubjectTerms Artificial Intelligence
Computational Intelligence
Engineering
English language
Italian language
Knowledge
Linguistics
Machine translation
Morphology
Natural language
Original Research
Parsers
Robotics and Automation
Semantics
Syntax
User Interfaces and Human Computer Interaction
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Title Assessing BERT’s ability to learn Italian syntax: a study on null-subject and agreement phenomena
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