Event Detection Aliaksei Antonau alant4741@mail.ru 1 5. Juli 2016 1

Learning to Extract Local Events from the Web John Foley, Michael Bendersky and Vanja Josifovski Aliaksei Antonau 5. Juli 2016

Introduction Aliaksei Antonau 5. Juli 2016

Introduction Aliaksei Antonau 5. Juli 2016

Schema.org “Schema.org is a collaborative, community activity with a mission to create, maintain, and promote schemas for structured data on the Internet, on web pages, in email messages, and beyond.” Aliaksei Antonau 5. Juli 2016

Schema.org Aliaksei Antonau 5. Juli 2016

Event Extraction Model Aliaksei Antonau 5. Juli 2016

Experimental Setup Aliaksei Antonau 5. Juli 2016

Collecting Judgments Aliaksei Antonau 5. Juli 2016

Event Prediction Results Aliaksei Antonau 5. Juli 2016

Precision Evaluation Aliaksei Antonau 5. Juli 2016

Aliaksei Antonau 5. Juli 2016

Aliaksei Antonau 5. Juli 2016

Conclusion In this paper authors introduce task: to retrieve and recommend events that users might want to attend. They focus on the identification and extraction of local events. Authors show, that using semantic web technologies, and specifically Schema.org microdata can be useful for training approaches to extraction problems like the one they explored. Aliaksei Antonau 5. Juli 2016

15 Aliaksei Antonau 5. Juli 2016

Generating Event Causality Hypotheses through Semantic Relations Chikara Hashimoto, Kentaro Torisawa, Julien Kloetzer and Jong-Hoon Oh Aliaksei Antonau 5. Juli 2016

Introduction Goal: develop method of generating plausible event causality hypotheses from other event causalities extracted from the web. Aliaksei Antonau 5. Juli 2016

Introduction Application Reason for generating NEW hypotheses: Future event prediction Why-question answering Future scenario generation Reason for generating NEW hypotheses: It is unlikely that all the event causalities that we recognize in this world are written in corpora Aliaksei Antonau 5. Juli 2016

Proposed Method Semantic relation database records which binary pattern, e.g., A CAUSES B, which indicates a semantic relation, co-occurs with which noun pairs. Binary patterns: Causation. A CAUSES B (deforestation and global warming) Material. B IS MADE OF A (plutonium and atomic bomb) Necessity. B REQUIRES A (ability to think and verbal aptitude) Use. A IS USED FOR B (e-mailer and exchanges of e-mail messages) Prevention. A PREVENTS B (a mosquito net and malaria) Aliaksei Antonau 5. Juli 2016

Hypotheses candidates generation Proposed Method Event Causalities, extracted from the web Extraction of phrase pairs as event causality candidates from single sentences in 600 million web pages. Replacement of the original noun pair of a source event causality with other noun pairs from web. Plausible hypothesis candidates are identified by an SVM classifier. Hypotheses candidates generation Hypotheses Ranking Aliaksei Antonau 5. Juli 2016

Proposed Method Generated event causality Deploy a mosquito net → avoid malaria On phrase pair level On noun pair level novelty hypotheses it novelty hypotheses it will be will be REJECTED IF Source includes: Deploy a → avoid Use a → prevent mosquito net malaria mosquito net malaria Aliaksei Antonau 5. Juli 2016

Experimental Setup Source for extracting event causalities: 600 million web pages 132,528,706 event causality candidates extracted 2,451,254 event causalities after applying filters These 2.4M events were used for generating hypotheses All pages and events in Japanese language Aliaksei Antonau 5. Juli 2016

Results in noun pair level novelty setting Aliaksei Antonau 5. Juli 2016

Results in phrase pair level novelty setting Aliaksei Antonau 5. Juli 2016

Conclusion Authors proposed a method of hypothesizing plausible event causality hypotheses from event causalities extracted from the web by using semantic relations. With 70% precision, proposed method generated 347,093 noun pair level novelty hypotheses and 302,350 phrase pair level novelty hypotheses from the 2.4M event causalities extracted from the web. Aliaksei Antonau 5. Juli 2016

Thank You! Questions? Aliaksei Antonau 5. Juli 2016