[Lisa_seminaires] [TeaTalk] Jackie Cheung, June 13, Z-209, 14:00

Dzmitry Bahdanau dimabgv at gmail.com
Mar 13 Juin 11:35:12 EDT 2017


Hi all,

Reminder - this is happening today!

Dima

On Tue, 6 Jun 2017 at 08:42 Dzmitry Bahdanau <dimabgv at gmail.com> wrote:

> Hi all,
>
> Our next tea-talk will be given by Jackie C. K. Cheung, who is an
> assistant professor at McGill university. It will take place at Z-209
> (Pavillon Claire-McNicoll), on June 13, at 14:00. Hope you to see you in
> great numbers!
>
> *Please note the unusual day and time of the talk!*
>
> *Title: *Leveraging External Knowledge for Machine Comprehension of Rare
> Entities
>
> *Abstract: *Thanks to the "long tail" of natural language, entities that
> only appear a handful of times in a training corpus account for the vast
> majority of entities overall. Standard techniques for training word
> embeddings such as word2vec and GloVe do not scale well to modelling these
> entities, because they depend on having many entity or word occurrences for
> reliable word co-occurrence statistics. We propose to use external
> knowledge in the form of short entity definitions as a source of
> information to train entity representations. We describe experiments in two
> settings. In the first, we present a simple scheme for initializing entity
> representations for knowledge base completion. In the second, we introduce
> a new machine comprehension dataset, the Wikilinks Rare Entities data set,
> and an accompanying entity cloze task which requires predicting rare named
> entities in context. We describe a hierarchical double encoder model which
> reads a text passage and an entity definition in order to predict which
> entity fits in context. Our model substantially outperforms a number of
> strong baselines which do not utilize entity definitions, demonstrating the
> impact of external knowledge in making inferences about rare entities.
>
> *Bio:* Jackie CK Cheung is an assistant professor in the School of
> Computer Science at McGill University. He received his Ph.D. at the
> University of Toronto, and was awarded a Facebook Fellowship for his
> doctoral research. He conducts research in computational semantics and
> natural language generation, with a focus on topics such as inducing event
> structure from distributional semantics, and automatic summarization. His
> work is funded by the Natural Sciences and Engineering Research Council of
> Canada (NSERC), and the Fonds de recherche du Québec - Nature et
> technologies (FRQNT).
>
> Dima
>
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