Resource creation for opinion mining: a case study with Marathi movie reviews

With rapid growth in user generated contents on the Web, various NLP research areas are emerging to utilize this information in ways that will facilitate users to manipulate the data efficiently. Opinion mining is one such area of research gaining interest among researchers to develop automated NLP systems that will be able to analyze sentiments expressed in natural languages. Being language and domain dependent task, the opinion mining systems require language specific resources for better results. Several studies on this theme have been presented using number of techniques, most of which focus mainly on English. The essential resources like corpus, lexicon, parsers, etc. are scarce for resource poor languages. In this paper, we present our experiments on construction of opinion corpus and sentiment lexicon that will be used for mining opinions from Marathi language text. The corpus is constructed using review documents from one of the popular opinion mining domains, i.e. movie reviews. Different experiments have been carried out to validate the resources. The lexicon based document level polarity classification system attained F-measure of 0.75 and 0.56 for positive and negative classes respectively. The results encourage us to continue the line of research with further attempts in resources and system improvements. © 2021, Bharati Vidyapeeth's Institute of Computer Applications and Management.