9 March: Roger Evans (Brighton) - Friday 10 March, 4pm, UCD
Dublin Computational Linguistics Research Seminar: Index of March 2006 | Dublin Computational Linguistics Research Seminar - Index of year: 2006 | Full index
The next Computational Linguistics Research Seminar will feature a
talk by Dr Roger Evans, of Natural Language Technology Group,
University of Brighton.
The seminar will take place
- on Friday March 10,
- at 4pm
- in Room B1.09
- in UCD's School of Computer Science and Informatics, Belfield Campus,
( on the map at http://www.ucd.ie/maps/campusmap05.jpg we are
building "22" an inch
to the left of the topleft corner of the central lake)
All are welcome to attend.
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Title:
Inheriting probabilities
Abstract:
Fifteen years ago, one of the key formal devices of rationalist
accounts of natural language was inheritance - using templates, type
systems, or specific inheritance languages. With the rise of empirical
approaches, inheritance fell distinctly out of favour, in part just
like many other trappings of rationalist formalising, but also in part
because it is not obvious what role inheritance can play in a world
dominated by probabilities - how can you inherit probabilities? Over
many of those fifteen years, Gerald Gazdar and myself have puzzled over
this problem, and after a few false starts, we devised a few years ago
a sensible-looking framework for extending our own inheritance-based
lexical description language, DATR, with a probabilistic component,
resulting in DATR-P. But devising a framework for inheriting
probabilities is only half the story - how do you determine what
probabilities to inherit? In this talk, I will briefly introduce the
DATR-P framework, discuss ways in which a probabilisitic lexical model
ought to be able to benefit from inheritance, and describe experiments
which seek to train simple inheritance-based models to illustrate these
benefits. Although these models are quite simple, the aim is to develop
techniques for inheriting probabilities which allow the full power of
DATR's various inheritance mechanisms to be exploited
probabilistically, and I will close with a sketch of what such a system
might one day be able to offer.
-------
The support for DCLRS2005-6 given by the School of Computer Science and
Informatics, UCD Dublin,
is gratefully acknowledged.
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Dublin Computational Linguistics Research Seminar - Index of March 2006 | Index of year: 2006 | Full index