[Colloquium] REMINDER: Research at TTIC: Kevin Gimpel
Dawn Ellis
dellis at ttic.edu
Thu Jun 12 09:42:54 CDT 2014
*This will be our last research talk for this school year; we will resume
in the fall. *
*Thank you for your continued support of the TTIC faculty!*
When: Friday, June 13th at noon
Where: TTIC, 6045 S Kenwood Avenue, 5th Floor, Room #526
Who: Kevin Gimpel, TTIC Faculty
Title: Enriched Unsupervised Natural Language Processing with
Cost-Augmented
Contrastive Estimation
Abstract:
We generalize contrastive estimation---a technique for discriminative
unsupervised learning---in two ways that allow us to add more knowledge to
unsupervised learning. Contrastive estimation uses a corruption function on
observations to generate negative examples during training. Our first
modification lets the modeler specify not only the set of corrupted inputs,
but also how bad each one is. The second allows specifying structural
preferences on the latent variable used to explain the observations. These
require setting additional hyperparameters, which can be problematic in
unsupervised learning, so we investigate new methods for unsupervised model
selection. We instantiate these ideas for unsupervised part-of-speech
tagging, improving over contrastive estimation as well as the strongest
systems from the PASCAL 2012 shared task.
***************************************
Research at TTIC Seminar Series
TTIC is hosting a weekly seminar series presenting the research currently
underway at the Institute. Every week a different TTIC faculty member will
present their research. The lectures are intended both for students
seeking research topics and adviser, and for the general TTIC and
University of Chicago communities interested in hearing what their
colleagues are up to.
To receive announcements about the seminar series, please subscribe to the
mailing list: https://groups.google.com/a/ttic.edu/group/talks/subscribe
Speaker details can be found at: http://www.ttic.edu/tticseminar.php.
For additional questions, please contact David McAllester at
mcallester at ttic.edu
--
*Dawn Ellis*
Administrative Coordinator,
Bookkeeper
773-834-1757
dellis at ttic.edu
TTIC
6045 S. Kenwood Ave.
Chicago, IL. 60637
--
*Dawn Ellis*
Administrative Coordinator,
Bookkeeper
773-834-1757
dellis at ttic.edu
TTIC
6045 S. Kenwood Ave.
Chicago, IL. 60637
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