Rasoul Kaljahi


2018

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Sentiment Expression Boundaries in Sentiment Polarity Classification
Rasoul Kaljahi | Jennifer Foster
Proceedings of the 9th Workshop on Computational Approaches to Subjectivity, Sentiment and Social Media Analysis

We investigate the effect of using sentiment expression boundaries in predicting sentiment polarity in aspect-level sentiment analysis. We manually annotate a freely available English sentiment polarity dataset with these boundaries and carry out a series of experiments which demonstrate that high quality sentiment expressions can boost the performance of polarity classification. Our experiments with neural architectures also show that CNN networks outperform LSTMs on this task and dataset.

2016

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Detecting Opinion Polarities using Kernel Methods
Rasoul Kaljahi | Jennifer Foster
Proceedings of the Workshop on Computational Modeling of People’s Opinions, Personality, and Emotions in Social Media (PEOPLES)

We investigate the application of kernel methods to representing both structural and lexical knowledge for predicting polarity of opinions in consumer product review. We introduce any-gram kernels which model lexical information in a significantly faster way than the traditional n-gram features, while capturing all possible orders of n-grams n in a sequence without the need to explicitly present a pre-specified set of such orders. We also present an effective format to represent constituency and dependency structure together with aspect terms and sentiment polarity scores. Furthermore, we modify the traditional tree kernel function to compute the similarity based on word embedding vectors instead of exact string match and present experiments using the new models.

2015

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Foreebank: Syntactic Analysis of Customer Support Forums
Rasoul Kaljahi | Jennifer Foster | Johann Roturier | Corentin Ribeyre | Teresa Lynn | Joseph Le Roux
Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing

2014

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Semantic Role Labelling with minimal resources: Experiments with French
Rasoul Kaljahi | Jennifer Foster | Johann Roturier
Proceedings of the Third Joint Conference on Lexical and Computational Semantics (*SEM 2014)

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Quality Estimation of English-French Machine Translation: A Detailed Study of the Role of Syntax
Rasoul Kaljahi | Jennifer Foster | Johann Roturier | Raphael Rubino
Proceedings of COLING 2014, the 25th International Conference on Computational Linguistics: Technical Papers

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Syntax and Semantics in Quality Estimation of Machine Translation
Rasoul Kaljahi | Jennifer Foster | Johann Roturier
Proceedings of SSST-8, Eighth Workshop on Syntax, Semantics and Structure in Statistical Translation