Identifying Text Polarity Using Random Walks

Automatically identifying the polarity of words is a very important task in Natural Language Processing. It has applications in text classification, text filtering, analysis of product review, analysis of responses to surveys, and mining online discussions. We propose a method for identifying the polarity of words. We apply a Markov random walk model to a large word relatedness graph, producing a polarity estimate for any given word. A key advantage of the model is its ability to accurately and quickly assign a polarity sign and magnitude to any word. The method could be used both in a semi-supervised setting where a training set of labeled words is used, and in an unsupervised setting where a handful of seeds is used to define the two polarity classes. The method is experimentally tested using a manually labeled set of positive and negative words. It outperforms the state of the art methods in the semi-supervised setting. The results in the unsupervised setting is comparable to the b...

• Type: Journal
• Year: 2010
• Where: ACL
• Authors: Ahmed Hassan, Dragomir R. Radev
• Keywords: ACL 2010, Computational Linguistics, Natural Language Processing, Polarity Estimate, Word Relatedness Graph