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The Relevance of Events in News Articles

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BSc Thesis presentation by Quinten van Langen

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The Relevance of Events in News Articles

  1. 1. The Relevance of Events in News Articles Quinten van Langen Supervisor: Oana Inel Vrije Universiteit, 21 June 2017
  2. 2. Introduction Can we determine a relevance score of events and its participating entities in news articles?
  3. 3. Related work 1: Event registry: learning about world events from news, Leban, Gregor and Fortuna, Blaz and Brank, Janez and Grobelnik, Marko, 2014 2: The Concentric Nature of News Semantic Snapshots: Knowledge Extraction for Semantic Annotation of News Items, García, José Luis Redondo, Giuseppe Rizzo, and Raphaël Troncy, 2015 ● Event Registry1 ● The NSS model2 ○ Core ○ Crust
  4. 4. Methodology 1: The Concentric Nature of News Semantic Snapshots: Knowledge Extraction for Semantic Annotation of News Items, García, José Luis Redondo, Giuseppe Rizzo, and Raphaël Troncy, 2015
  5. 5. Data ● ECB+ dataset2 annotated by experts 2 : Guidelines for ECB+ annotation of events and their coreference, Cybulska, Agata and Vossen, Piek, 2014 Annotation example .. another person in 1999 while she visited him in prison . Relations Causal relation : pulled on → fleeing Temporal relation : Monday → pulls on
  6. 6. Preliminary Experiment ● Approach ○ Occurrence ● Problems ○ Similar words ○ Stop words ○ Similar scores
  7. 7. Main Experiment ● Approach to solve problems ○ Lemmatization/stemming ○ Similarity comparison ○ TF-IDF ○ Considering temporal and causal relations between events ○ Core and Crust scores ■ Core: Relations with all entities in Core ■ Crust: Relation with an entity in Core
  8. 8. Crowdsourcing for Links (Event - Actor/Place/Time)
  9. 9. Final Results ● Evaluation: ○ F-score events : > 0.5
  10. 10. Discussion & Conclusion ● Corereference ● Limited scores for actors, locations and time periods ○ Better NSS models ○ Change of scores for events Research Question: Can we determine a relevance score of events and its participating entities in news articles? Answer: Yes, but…
  11. 11. Thank you for listening! Quinten van Langen q.i.van.langen@student.vu.nl Oana Inel

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