Raksha Sharma


2021

pdf bib
NLPIITR at SemEval-2021 Task 6: RoBERTa Model with Data Augmentation for Persuasion Techniques Detection
Vansh Gupta | Raksha Sharma
Proceedings of the 15th International Workshop on Semantic Evaluation (SemEval-2021)

This paper describes and examines different systems to address Task 6 of SemEval-2021: Detection of Persuasion Techniques In Texts And Images, Subtask 1. The task aims to build a model for identifying rhetorical and psycho- logical techniques (such as causal oversimplification, name-calling, smear) in the textual content of a meme which is often used in a disinformation campaign to influence the users. The paper provides an extensive comparison among various machine learning systems as a solution to the task. We elaborate on the pre-processing of the text data in favor of the task and present ways to overcome the class imbalance. The results show that fine-tuning a RoBERTa model gave the best results with an F1-Micro score of 0.51 on the development set.

pdf bib
Team_KGP at SemEval-2021 Task 7: A Deep Neural System to Detect Humor and Offense with Their Ratings in the Text Data
Anik Mondal | Raksha Sharma
Proceedings of the 15th International Workshop on Semantic Evaluation (SemEval-2021)

This paper describes the system submitted to SemEval-2021 Task-7 for all four subtasks. Two subtasks focus on detecting humor and offense from the text (binary classification). On the other hand, the other two subtasks predict humor and offense ratings of the text (linear regression). In this paper, we present two different types of fine-tuning methods by using linear layers and bi-LSTM layers on top of the pre-trained BERT model. Results show that our system is able to outperform baseline models by a significant margin. We report F1 scores of 0.90 for the first subtask and 0.53 for the third subtask, while we report an RMSE of 0.57 and 0.58 for the second and fourth subtasks, respectively.

2018

pdf bib
Identifying Transferable Information Across Domains for Cross-domain Sentiment Classification
Raksha Sharma | Pushpak Bhattacharyya | Sandipan Dandapat | Himanshu Sharad Bhatt
Proceedings of the 56th Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)

Getting manually labeled data in each domain is always an expensive and a time consuming task. Cross-domain sentiment analysis has emerged as a demanding concept where a labeled source domain facilitates a sentiment classifier for an unlabeled target domain. However, polarity orientation (positive or negative) and the significance of a word to express an opinion often differ from one domain to another domain. Owing to these differences, cross-domain sentiment classification is still a challenging task. In this paper, we propose that words that do not change their polarity and significance represent the transferable (usable) information across domains for cross-domain sentiment classification. We present a novel approach based on χ2 test and cosine-similarity between context vector of words to identify polarity preserving significant words across domains. Furthermore, we show that a weighted ensemble of the classifiers enhances the cross-domain classification performance.

2017

pdf bib
Sentiment Intensity Ranking among Adjectives Using Sentiment Bearing Word Embeddings
Raksha Sharma | Arpan Somani | Lakshya Kumar | Pushpak Bhattacharyya
Proceedings of the 2017 Conference on Empirical Methods in Natural Language Processing

Identification of intensity ordering among polar (positive or negative) words which have the same semantics can lead to a fine-grained sentiment analysis. For example, ‘master’, ‘seasoned’ and ‘familiar’ point to different intensity levels, though they all convey the same meaning (semantics), i.e., expertise: having a good knowledge of. In this paper, we propose a semi-supervised technique that uses sentiment bearing word embeddings to produce a continuous ranking among adjectives that share common semantics. Our system demonstrates a strong Spearman’s rank correlation of 0.83 with the gold standard ranking. We show that sentiment bearing word embeddings facilitate a more accurate intensity ranking system than other standard word embeddings (word2vec and GloVe). Word2vec is the state-of-the-art for intensity ordering task.

2016

pdf bib
Meaning Matters: Senses of Words are More Informative than Words for Cross-domain Sentiment Analysis
Raksha Sharma | Sudha Bhingardive | Pushpak Bhattacharyya
Proceedings of the 13th International Conference on Natural Language Processing

pdf bib
High, Medium or Low? Detecting Intensity Variation Among polar synonyms in WordNet
Raksha Sharma | Pushpak Bhattacharyya
Proceedings of the 8th Global WordNet Conference (GWC)

For fine-grained sentiment analysis, we need to go beyond zero-one polarity and find a way to compare adjectives (synonyms) that share the same sense. Choice of a word from a set of synonyms, provides a way to select the exact polarity-intensity. For example, choosing to describe a person as benevolent rather than kind1 changes the intensity of the expression. In this paper, we present a sense based lexical resource, where synonyms are assigned intensity levels, viz., high, medium and low. We show that the measure P (s|w) (probability of a sense s given the word w) can derive the intensity of a word within the sense. We observe a statistically significant positive correlation between P(s|w) and intensity of synonyms for three languages, viz., English, Marathi and Hindi. The average correlation scores are 0.47 for English, 0.56 for Marathi and 0.58 for Hindi.

2015

pdf bib
Adjective Intensity and Sentiment Analysis
Raksha Sharma | Mohit Gupta | Astha Agarwal | Pushpak Bhattacharyya
Proceedings of the 2015 Conference on Empirical Methods in Natural Language Processing

pdf bib
Domain Sentiment Matters: A Two Stage Sentiment Analyzer
Raksha Sharma | Pushpak Bhattacharyya
Proceedings of the 12th International Conference on Natural Language Processing

2014

pdf bib
A Sentiment Analyzer for Hindi Using Hindi Senti Lexicon
Raksha Sharma | Pushpak Bhattacharyya
Proceedings of the 11th International Conference on Natural Language Processing

2013

pdf bib
Detecting Domain Dedicated Polar Words
Raksha Sharma | Pushpak Bhattacharyya
Proceedings of the Sixth International Joint Conference on Natural Language Processing