DidaxTo – Learning Patterns for Discovering Domain Oriented Opinion Words


didaxtoDidaxTo 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 AgathangelouIoannis 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.

01sDidaxTo main window.
01sAnalysis of the generated patterns.
03sPatterns discovered by DidaxTo.
04sContribution of each stage of the DidaxTo approach.
05sEvaluation Charts
Agreement (True) vs Disagreement (False) between DidaxTo and the reviewers.
01sOpinion classification using the dictionary extracted by DidaxTo.
01sThe settings window of DidaxTo.


  • DidaxTo (v.2.0.2) – 8.6MB zip
    Includes the application, user’s guide and demo datasets. You must have the Java Runtime Environment (JRE) installed in order to run.

DidaxTo – Version History

  • v.2.0.2 – 2016-12-10
    [+] Evaluation Metrics Added (Precision, Recall, F-Score)
  • v.2.0.1 – 2016-05-22: (First Public Release)
    [+] Activated Sentiment Inheritance in Opinion Targets.
  • v.2.0.0:
    [+] Α stemmer was added for use in the pattern exploitation process.
  • v.1.6.0:  GUI and Operational improvements.
  • v.1.5.0:
    [+] “Pattern Utility Info” in the “Lexicon Extraction & Pattern Evaluation” tab.
    [+] “Pattern Extraction Info” in the “Lexicon Extraction & Pattern Evaluation” tab.
    Improvements in the “Domain Lexicon Evaluation” tab.
  • v.1.0.0: Initial internal release.

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