Events Calendar

NL Seminar - From Noisy Information Extraction to Rich Information Retrieval in Unusual Domains

Speaker: Mayank Kejriwal, USC/ISI

Talk Title: From Noisy Information Extraction to Rich Information Retrieval in Unusual Domains

Series: Natural Language Seminar

Abstract: Information Extraction IE or the algorithmic extraction of named entities, relations and attributes of interest from text-rich data is an important natural language processing task. In this talk, I will discuss the relationship of IE to fine-grained Information Retrieval IR, especially when the domain of interest is unusual i.e. computationally under-studied, socially consequential and difficult to analyze. In particular, such domains exhibit a significant long-tail effect, and their language models are obfuscated. Using real-world examples and results obtained in recent DARPA MEMEX evaluations, I will discuss how our search system uses semantic strategies to usefully facilitate complex information needs of investigative users in the human trafficking domain, even when IE outputs are extremely noisy. I briefly report recent results obtained from a user study conducted by DARPA, and the lessons learned thereof for both IE and IR research.



Biography: Mayank Kejriwal is a computer scientist in the Information integration group at ISI. He received his Ph.D. from the University of Texas at Austin under Daniel P. Miranker. His dissertation involved domain-independent linking and resolving of structured Web entities at scale, and was published as a book in the Studies in the Semantic Web series. At ISI, he is involved in the DARPA MEMEX, LORELEI and D3M projects. His current research sits at the intersection of knowledge graph construction, search, inference and analytics, especially over Web corpora in unusual social domains.

Host: Marjan Ghazvininejad and Kevin Knight

More Info: http://nlg.isi.edu/nl-seminar/

Location: Information Science Institute (ISI) - 11th Flr Conf Rm # 1135, Marina Del Rey

Audiences: Everyone Is Invited

Contact: Peter Zamar

Event Link: http://nlg.isi.edu/nl-seminar/