{"id":8302,"date":"2021-11-09T08:05:20","date_gmt":"2021-11-09T07:05:20","guid":{"rendered":"https:\/\/ensai.fr\/?p=8302"},"modified":"2021-11-10T09:10:26","modified_gmt":"2021-11-10T08:10:26","slug":"francois-portier-associate-professor-statistics","status":"publish","type":"post","link":"https:\/\/ensai.fr\/en\/francois-portier-associate-professor-statistics\/","title":{"rendered":"Welcome to Fran\u00e7ois Portier, Associate Professor of Statistics\u00a0"},"content":{"rendered":"<p><strong>Fran\u00e7ois Portier recently joined ENSAI as an associate professor of Statistics and researcher at <a href=\"http:\/\/crest.science\/\" target=\"_blank\" rel=\"noopener\">CREST<\/a>. Born and educated in Brittany, his academic career took him to <a href=\"https:\/\/uclouvain.be\/en\/index.html\" target=\"_blank\" rel=\"noopener\">UCLouvain<\/a> and <a href=\"https:\/\/www.telecom-paris.fr\/en\/home\">T\u00e9l\u00e9com Paris<\/a>. He is already collaborating on research projects with members of the ENSAI faculty. <\/strong><\/p>\n<p>Fran\u00e7ois Portier teaches Machine Learning, Statistics and Computational Statistics classes for <a href=\"https:\/\/ensai.fr\/en\/2-cursus\/cursus-ingenieur-2\/\">third-year<\/a> and <a href=\"https:\/\/ensai.fr\/en\/2-cursus\/msc-statistics-for-smart-data\/\">Master in Statistics for Smart Data<\/a> students.<\/p>\n<h3>Back to Rennes<\/h3>\n<p>\u201c<em>I am a typical product of Universit\u00e9 de Rennes 1, where I did all my studies, including a PhD on parsimonious predictive models under the direction of Bernard Delyon.<\/em>\u201d<\/p>\n<p>Fran\u00e7ois Portier left Rennes to join <a href=\"https:\/\/uclouvain.be\/en\/index.html\" target=\"_blank\" rel=\"noopener\">UCLouvain<\/a> as a postdoctoral researcher, within the team of <a href=\"https:\/\/scholar.google.be\/citations?user=6Sb63foAAAAJ&amp;hl=nl\" target=\"_blank\" rel=\"noopener\">Ingrid Van Keilegom<\/a> and <a href=\"https:\/\/scholar.google.be\/citations?user=fA6rT1sAAAAJ&amp;hl=nl\" target=\"_blank\" rel=\"noopener\">Johan Segers<\/a>. He worked on specific survival analysis models. In 2016, he became an assistant professor at <a href=\"https:\/\/www.telecom-paris.fr\/en\/home\">T\u00e9l\u00e9com Paris<\/a>, where he taught and pursued his research until 2021.<\/p>\n<p>Fran\u00e7ois Portier joined ENSAI in September. Shortly after, he defended his HDR thesis (Habilitation \u00e0 Diriger les Recherches), which acknowledges scientific achievement and the capacity to supervise doctoral research.<\/p>\n<p>A native of Vannes, Fran\u00e7ois Portier appreciates being back in Brittany and seizes every occasion to go sailing, a life-long passion.<\/p>\n<h3>Developing mathematical tools to study algorithms<\/h3>\n<blockquote><p>\u201cMy research interests lie in mathematical statistics. What interests me the most is to describe algorithms from a mathematical angle: looking for the very fundamental properties that explain the success or the failure of certain algorithms. I used to work on algorithms from semi-parametrical statistics and high-dimensional statistics, however, since my time at T\u00e9l\u00e9com Paris, my research areas have become more linked to machine learning.\u201d<\/p><\/blockquote>\n<p>Fran\u00e7ois Portier&#8217;s research is largely based on empirical process theory applied to different domains such as dimension reduction or more recently <strong>nearest neighbor based algorithms<\/strong>.<\/p>\n<p>The proximity of fellow ENSAI and CREST researchers sharing similar interests is already leading to common projects. Fran\u00e7ois Portier should collaborate with <a href=\"https:\/\/ensai.fr\/en\/equipe\/adrien-saumard\/\">Adrien Saumard<\/a> and <a href=\"https:\/\/ensai.fr\/en\/equipe\/valentin-patilea\/\">Valentin Patilea<\/a> in the future, namely on machine learning algorithms and model selection.<\/p>\n<p>\u201c<em>Together with Valentin Patilea, we will work on a more traditional component of statistics: model evaluation using goodness of fit test. We will try to build a measure that will give us an indicator for the validity of parametric models.<\/em>\u201d<\/p>\n<p>Fran\u00e7ois Portier is also working on a project he developed while at T\u00e9l\u00e9com Paris, together with <a href=\"https:\/\/remileluc.github.io\/\" target=\"_blank\" rel=\"noopener\">R\u00e9mi Leluc, a PhD student<\/a> there. The project, \u201cMusketeer\u201d, is an algorithm dedicated to the optimization of high-dimensional functions for large-scale learning. Fran\u00e7ois Portier and his colleague use a <strong>stochastic gradient descent method linked to algorithm efficiency<\/strong>. As calculating the derivatives with respect to each variable takes time, \u201cMusketeer\u201d selects carefully which coordinate derivative to evaluate.<\/p>\n<p>\u201c<em>The algorithm is called Musketeer, because of the motto &#8220;one for all and all for one.\u201d The coordinates of the gradient communicate, which makes the algorithm efficient.\u00a0 One of them will do the calculation for the others and then share the information. They will in turn update and know if the coordinates were useful or not.<\/em>\u201d<\/p>\n<p>Welcome to ENSAI!<\/p>\n<p>&nbsp;<\/p>\n<h3>Milestones<\/h3>\n<p><strong>2010 to 2013:<\/strong> PhD at Universit\u00e9 de Rennes 1<\/p>\n<p><strong>2013 to 2016:<\/strong> postdoctoral fellow at UCLouvain<\/p>\n<p><strong>2016:<\/strong> Assistant professor of Statistics at T\u00e9l\u00e9com Paris.<\/p>\n<p><strong>2021:<\/strong>\u00a0Associate professor of Statistics at ENSAI<\/p>\n<p>&nbsp;<\/p>\n<p><em><strong>Find out more about Fran\u00e7ois Portier and <a href=\"https:\/\/ensai.fr\/en\/recherche\/projets-de-recherche\/\">research at ENSAI and CREST laboratory<\/a>.\u00a0<\/strong><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fran\u00e7ois Portier recently joined ENSAI as an associate professor of Statistics and&#8230; <br \/><a class=\"readmore\" href=\"https:\/\/ensai.fr\/en\/francois-portier-associate-professor-statistics\/\">Lire la suite<\/a><\/p>\n","protected":false},"author":73,"featured_media":8304,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[185],"tags":[343],"class_list":["post-8302","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-research-innovation","tag-faculty"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Welcome to Fran\u00e7ois Portier, Associate Professor of Statistics\u00a0 | ENSAI<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ensai.fr\/en\/francois-portier-associate-professor-statistics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Welcome to Fran\u00e7ois Portier, Associate Professor of Statistics\u00a0 | ENSAI\" \/>\n<meta property=\"og:description\" content=\"Fran\u00e7ois Portier recently joined ENSAI as an associate professor of Statistics and... 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