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TZID:Europe/Paris
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UID:6769@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20200323T140000
DTEND;TZID=Europe/Paris:20200323T170000
DTSTAMP:20241120T202002Z
URL:https://www.i2m.univ-amu.fr/evenements/marianne-clausel-universite-de-
 lorraine-a-smooth-consistent-regression-tree-and-ensemble-extensions-throu
 gh-rf-and-gbt/
SUMMARY: (...): Marianne Clausel (université de Lorraine) : "A smooth\, co
 nsistent regression tree and ensemble extensions through RF and GBT"
DESCRIPTION:: Résumé :\n\n&nbsp\;\n\nA smooth\, consistent regression tre
 e and ensemble extensions\nthrough RF and GBT\n\nJoint work with S. Alkhou
 ry (LIG)\, E. Devijver (LIG) and E. Gaussier (LIG)\n\n\nTree-based ensembl
 e methods\, as Random\nForests and Gradient Boosted Trees\, have been\nsuc
 cessfully used for regression problems in many\napplications and research 
 studies. We propose\nhere a generalization of regression trees\, referred\
 nto as smooth trees\, that adapt to the smoothness\nof the link function. 
 By doing so\, one consid-\ners that an observation\, even though it belong
 s\nto a particular region\, can still be associated to\nother regions with
  a certain weight that depends\non the distance between the observation an
 d the\nregion. This generalization raises several difficult\nquestions\, i
 n particular regarding consistency. We\nshow here that smooth trees are in
 deed consistent\,\na property that has not been established\, as far\nas w
 e know\, on previous proposals as soft trees.\nWe then show how smooth reg
 ression trees can\nbe used in different ensemble methods\, namely\nRandom 
 Forests and Gradient Boosted Trees. Ex-\nperiments conducted on several da
 ta sets further\nillustrate the good behavior of smooth trees and\ntheir e
 nsemble extensions.
CATEGORIES:Séminaire,Statistique
LOCATION:Saint-Charles - FRUMAM (3ème étage)\, 3\, place Victor Hugo\, Ma
 rseille\, 13003\, France
X-APPLE-STRUCTURED-LOCATION;VALUE=URI;X-ADDRESS=3\, place Victor Hugo\, Mar
 seille\, 13003\, France;X-APPLE-RADIUS=100;X-TITLE=Saint-Charles - FRUMAM 
 (3ème étage):geo:0,0
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