DidaxTo implements an unsupervised approach for discovering patterns, that will extract a domain-specific dictionary from product reviews. The approach utilizes opinion modifiers, sentiment consistency theories, polarity assignment graphs and pattern similarity metrics. Apart from extracting the dictionary of opinion words, the application allows the evaluation of the dictionary by means of a sentiment classification task on product reviews.
The DidaxTo approach is fully presented in the following paper publiced by the Knowledge and Information Systems Journal (KAIS).
Pantelis Agathangelou, Ioannis Katakis, Ioannis Koutoulakis, Fotios Kokkoras and Dimitrios Gunopulos. “Learning Patterns for Discovering Domain Oriented Opinion Words“, Knowledge and Information Systems Journal (Springer), 55(1), pp.45-77, 2018. DOI: 10.1007/s10115-017-1072-y
DidaxTo (the application) is available for free for non-commercial use. It was developed by Pantelis Agathangelou under the scientific supervision of Ioannis Katakis.