[Colloquium] REMINDER: 2/5 Research at TTIC: Karen Livescu, TTIC

[Mary Marre]

When:     Friday, February 5th at noon

Where:    TTIC, 6045 S Kenwood Avenue, 5th Floor, Room 526

Who:      Karen Livescu, TTIC


Title:
Toward Neural Segmental Sequence Models

Abstract:
Many sequence prediction tasks---such as automatic speech recognition and
video analysis---involve inferring and labeling contiguous segments of
multiple time frames.  However, state-of-the-art models for such tasks
still operate one time frame at a time, typically relying on hidden Markov
models (HMMs) to combine frame-level features.  One way of utilizing
long-range features is through segmental (semi-Markov) models such
as segmental conditional random fields.  Such models have had some success,
but have been constrained by the computational needs of considering all
possible segmentations.  We have been developing new
large-margin segmental models, with features based
on neural segment embeddings, that are efficient enough for first-pass
decoding.  In our initial work with these models, we have found that they
outperform frame-based HMM/deep network baselines on two disparate tasks,
phonetic recognition and sign language recognition from video.  I will
present the models and their results on these tasks, as well as related
recent work on neural segmental acoustic word embeddings.

This is joint work with Hao Tang, Taehwan Kim, Herman Kamper, Weiran Wang,
and Kevin Gimpel


********************************************************************

*Research at TTIC Seminar Series*

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For additional questions, please contact David McAllester at
mcallester at ttic.edu




Mary C. Marre
Administrative Assistant
*Toyota Technological Institute*
*6045 S. Kenwood Avenue*
*Room 504*
*Chicago, IL  60637*
*p:(773) 834-1757*
*f: (773) 357-6970*
*mmarre at ttic.edu <mmarre at ttic.edu>*
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