Exploring Multi-lingual, Multi-task, and Adversarial Learning for Low-resource Sentiment Analysis
Mamta Mamta, Asif Ekbal, Pushpak Bhattacharyya
Abstract
Deep learning has become most prominent in solving various Natural Language Processing (NLP) tasks including sentiment analysis. However, these techniques require a considerably large amount of annotated corpus, which is not easy to obtain for most of the languages, especially under the scenario of low-resource settings. In this article, we propose a deep multi-task multi-lingual adversarial framework to solve the resource-scarcity problem of sentiment analysis by leveraging the useful and relevant knowledge from a high-resource language. To transfer the knowledge between the different languages, both the languages are mapped to the shared semantic space using cross-lingual word embeddings. We evaluate our proposed architecture on a low-resource language, Hindi, using English as the high-resource language. Experiments show that our proposed model achieves an accuracy of 60.09% for the movie review dataset and 72.14% for the product review dataset. The effectiveness of our proposed approach is demonstrated with significant performance gains over the state-of-the-art systems and translation-based baselines.