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Licentiate seminar: Olof Mogren – Multi-Document Summarization and Semantic Relatedness

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Olof Mogren (Department of Computer Science and Engineering) will defend his licentiate thesis Multi-Document Summarization and Semantic Relatedness.

Abstract:
Automatic summarization is the process of presenting the contents of written documents in a short, comprehensive fashion. Many approaches have been proposed for this problem, some of which extract content from the input documents (extractive me thods), and others that generate the language in the summary based on some representation of the document contents (abstractive methods).

This thesis is concerned with extractive summarization in the multi-document setting, and we define the problem as choosing the most informative sentences from the input documents, while minimizing the redundancy in the summary. This definition calls for a way ofmeasuring the similarity between sentences that captures as much as possble of the meaning. We present novel ways of measuring the similarity between sentences, based on neural word embeddings and sentiment analysis. We also show that combining multiple sentence similarity scores, by multiplicative aggregation, helps in the process of creating better extractive summaries.

We also discuss the use of information extraction for improving the quality of automatic summarization by providing ways of assessing the salience of information elements, as well as helping with the fluency of the output and providing the temporal dimension.

Furthermore, we present graph-based algorithms for clustering words by co-occurrence, and for summarizing short online user-reviews by computing bicliques. The biclique algorithm provides a fast, simple algorithm for summarization in many e-commerce settings.

Opponent:
Tapani Raiko from Aalto University.

Thesis fulltext: http://www.cse.chalmers.se/~mogren/lic/mogren2015licentiate.pdf

Date: 2015-11-20 10:00 - 12:00

Location: ML2, Hörsalsvägen 7B, Chalmers

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Page updated: 2015-11-06 16:16

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