[Forum SIS] Seminario KNOWLES

[Matteo Ruggiero]

*****************************************************************
CICLO DI SEMINARI  -  COLLEGIO CARLO ALBERTO
*****************************************************************

Nell'ambito del ciclo di seminari organizzato dalla
"de Castro" Statistics Initiative (http://www.carloalberto.org/stats),
alle ore 12.00 di Venerdi' 20 Aprile 2012,
presso la Sala Rossa del Collegio Carlo Alberto,
via Real Collegio 30, 10024, Moncalieri (TO),
si terra' il seguente seminario:


DAVID KNOWLES (University of Cambridge, UK)

DIFFUSION TREES AS PRIORS


Abstract:
The Dirichlet diffusion tree [Neal, 2001] has attractive 
theoretical properties and empirical performance on 
various tasks. We present an extension which removes 
the restriction to binary trees allowing arbitrary 
branching structure, the Pitman Yor diffusion tree. 
We show this process is exchangeable and projective. 
Both the DDT and PYDT can be constructed as continuum 
limits of nested CRP models. We demonstrate efficient 
deterministic and sampling based inference. Finally we 
discuss some open modelling questions, such as whether 
to use fragmentation or coalescent processes as priors in 
hierarchical clustering, and what types of diffusion 
processes should be preferred.

Tutti gli interessati sono invitati a partecipare.

---------
Matteo Ruggiero
University of Torino & Collegio Carlo Alberto
http://web.econ.unito.it/ruggiero

-------------- parte successiva --------------
Un allegato HTML è stato rimosso...
URL: <http://www.stat.unipg.it/pipermail/sis/attachments/20120413/602a5dfc/attachment.html>