UTMN at SemEval-2020 Task 11: A Kitchen Solution to Automatic Propaganda Detection

Abstract

The article describes a fast solution to propaganda detection at SemEval-2020 Task 11, based on feature adjustment. We use per-token vectorization of features and a simple Logistic Regression classifier to quickly test different hypotheses about our data. We come up with what seems to us the best solution, however, we are unable to align it with the result of the metric suggested by the organizers of the task. We test how our system handles class and feature imbalance by varying the number of samples of two classes (Propaganda and None) in the training set, the size of a context window in which a token is vectorized and combination of vectorization means. The result of our system at SemEval2020 Task 11 is F-score=0.37. This work is licensed under a Creative Commons Attribution 4.0 International Licence. Licence details: http:// creativecommons.org/licenses/by/4.0/.1 https://www.datasciencesociety.net/hack-news-datathon/ 2 These 18 techniques have grown from the 1930s American Institute of Propaganda Analysis materials (Miller, 1939) and more recent investigations both into the tools of propaganda (Torok, 2015; Teninbaum, 2009, and others), and into the rules of good argument (Weston, 2018).