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Syntax-ignorant N-gram embeddings for dialectal Arabic sentiment analysis

Published online by Cambridge University Press:  16 March 2020

Hala Mulki Open the ORCID record for Hala Mulki [Opens in a new window] ,
Hatem Haddad ,
Mourad Gridach  and
Ismail Babaoğlu
Hala Mulki*
Affiliation:
Department of Computer Engineering, Konya Technical University, Turkey
Hatem Haddad
Affiliation:
RIADI Laboratory, National School of Computer Sciences, University of Manouba, Tunisia
Mourad Gridach
Affiliation:
Department of Computer Science, University of Oxford, Oxfordshire, United Kingdom
Ismail Babaoğlu
Affiliation:
Department of Computer Engineering, Konya Technical Univeristy, Turkey
*
*Corresponding author. E-mail: [email protected]
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Abstract

Arabic sentiment analysis models have recently employed compositional paragraph or sentence embedding features to represent the informal Arabic dialectal content. These embeddings are mostly composed via ordered, syntax-aware composition functions and learned within deep neural network architectures. With the differences in the syntactic structure and words’ order among the Arabic dialects, a sentiment analysis system developed for one dialect might not be efficient for the others. Here we present syntax-ignorant, sentiment-specific n-gram embeddings for sentiment analysis of several Arabic dialects. The novelty of the proposed model is illustrated through its features and architecture. In the proposed model, the sentiment is expressed by embeddings, composed via the unordered additive composition function and learned within a shallow neural architecture. To evaluate the generated embeddings, they were compared with the state-of-the art word/paragraph embeddings. This involved investigating their efficiency, as expressive sentiment features, based on the visualisation maps constructed for our n-gram embeddings and word2vec/doc2vec. In addition, using several Eastern/Western Arabic datasets of single-dialect and multi-dialectal contents, the ability of our embeddings to recognise the sentiment was investigated against word/paragraph embeddings-based models. This comparison was performed within both shallow and deep neural network architectures and with two unordered composition functions employed. The results revealed that the introduced syntax-ignorant embeddings could represent single and combinations of different dialects efficiently, as our shallow sentiment analysis model, trained with the proposed n-gram embeddings, could outperform the word2vec/doc2vec models and rival deep neural architectures consuming, remarkably, less training time.

Keywords

n-gram embeddingsUnordered compositionalityArabic dialectsSentiment analysis
Type
Article
Information
Natural Language Engineering , Volume 27 , Issue 3 , May 2021 , pp. 315 - 338
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Copyright
© Cambridge University Press 2020

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