{"id":2978,"date":"2025-04-30T17:07:28","date_gmt":"2025-04-30T16:07:28","guid":{"rendered":"https:\/\/edu.ge.ch\/site\/tablettepedagogique\/?p=2978"},"modified":"2025-05-02T17:53:35","modified_gmt":"2025-05-02T16:53:35","slug":"le-paradoxe-des-gros-modeles-de-langages","status":"publish","type":"post","link":"https:\/\/edu.ge.ch\/site\/tablettepedagogique\/2025\/04\/30\/le-paradoxe-des-gros-modeles-de-langages\/","title":{"rendered":"Le paradoxe des gros mod\u00e8les de langages"},"content":{"rendered":"<p>Il y a quelques semaines, Algorithmic Simplicity a publi\u00e9 une vid\u00e9o s\u2019int\u00e9ressant \u00e0 un \u00e9trange paradoxe : plus un mod\u00e8le est gros, moins il devrait \u00eatre capable de g\u00e9n\u00e9raliser, et ce n&#8217;est pourtant pas ce qu&#8217;on constate.<\/p>\n<p>D&#8217;abord, pourquoi un mod\u00e8le gros devrait-il \u00eatre moins bon ? C&#8217;est peut \u00eatre \u00e7a qui vous paraitra paradoxal. Eh bien, si un mod\u00e8le poss\u00e8de beaucoup de param\u00e8tres, il peut &#8220;apprendre par c\u0153ur&#8221; ses donn\u00e9es d&#8217;entra\u00eenement sans trouver de liens entre elles. C&#8217;est un peu comme si un \u00e9l\u00e8ve avait un cerveau assez gros pour tout m\u00e9moriser, sans faire de liens entre ses connaissances. Un tel mod\u00e8le serait excellent lors de l&#8217;entra\u00eenement mais incapable de g\u00e9n\u00e9raliser quand on lui donne de nouvelles donn\u00e9es. C&#8217;est ce qu&#8217;on appelle l&#8217;<em>overfitting<\/em>.<\/p>\n<p><!--more--><\/p>\n<p>Vous commencez \u00e0 sentir le paradoxe ? On a longtemps pens\u00e9 qu&#8217;augmenter la taille des mod\u00e8les ne permettrait pas d&#8217;en am\u00e9liorer les performances. Et pourtant les mod\u00e8les actuels sont &#8220;\u00e9normes&#8221;, et il semble qu&#8217;ils puissent finalement \u00eatre plus performants quand ils sont plus gros ! Apr\u00e8s le passage par une d\u00e9gradation, les performances se remettent \u00e0 s&#8217;am\u00e9liorer avec la taille :<\/p>\n<figure id=\"attachment_2979\" aria-describedby=\"caption-attachment-2979\" style=\"width: 290px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/edu.ge.ch\/site\/tablettepedagogique\/wp-content\/uploads\/sites\/7\/2025\/04\/2025-04-29-18_05_04-3-Cest-pourquoi-les-grands-modeles-de-langage-peuvent-comprendre-le-monde-Y.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2979 size-medium\" src=\"https:\/\/edu.ge.ch\/site\/tablettepedagogique\/wp-content\/uploads\/sites\/7\/2025\/04\/2025-04-29-18_05_04-3-Cest-pourquoi-les-grands-modeles-de-langage-peuvent-comprendre-le-monde-Y-300x185.png\" alt=\"\" width=\"300\" height=\"185\" srcset=\"https:\/\/edu.ge.ch\/site\/tablettepedagogique\/wp-content\/uploads\/sites\/7\/2025\/04\/2025-04-29-18_05_04-3-Cest-pourquoi-les-grands-modeles-de-langage-peuvent-comprendre-le-monde-Y-300x185.png 300w, https:\/\/edu.ge.ch\/site\/tablettepedagogique\/wp-content\/uploads\/sites\/7\/2025\/04\/2025-04-29-18_05_04-3-Cest-pourquoi-les-grands-modeles-de-langage-peuvent-comprendre-le-monde-Y-1024x630.png 1024w, https:\/\/edu.ge.ch\/site\/tablettepedagogique\/wp-content\/uploads\/sites\/7\/2025\/04\/2025-04-29-18_05_04-3-Cest-pourquoi-les-grands-modeles-de-langage-peuvent-comprendre-le-monde-Y-768x472.png 768w, https:\/\/edu.ge.ch\/site\/tablettepedagogique\/wp-content\/uploads\/sites\/7\/2025\/04\/2025-04-29-18_05_04-3-Cest-pourquoi-les-grands-modeles-de-langage-peuvent-comprendre-le-monde-Y-1536x945.png 1536w, https:\/\/edu.ge.ch\/site\/tablettepedagogique\/wp-content\/uploads\/sites\/7\/2025\/04\/2025-04-29-18_05_04-3-Cest-pourquoi-les-grands-modeles-de-langage-peuvent-comprendre-le-monde-Y-2048x1260.png 2048w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-2979\" class=\"wp-caption-text\">sur cette image, extraite de la vid\u00e9o, on voit que le taux d&#8217;erreur baisse d&#8217;abord quand on a des mod\u00e8les plus gros, qu&#8217;il remonte, puis qu&#8217;il rebaisse finalement<\/figcaption><\/figure>\n<p>Pourquoi ? Dans sa vid\u00e9o, Algorithmic Simplicity \u00e9voque deux explications :<\/p>\n<p>1) Pour comprendre la premi\u00e8re explication, il faut comprendre que lorsqu&#8217;on entra\u00eene une IA, on r\u00e9sout un probl\u00e8me d&#8217;optimisation : on cherche, parmi les mod\u00e8les possibles, un mod\u00e8le qui soit performant (\u00e0 la place de mod\u00e8le, vous pouvez penser &#8220;formule&#8221;, &#8220;fonction&#8221;, &#8220;programme&#8221;). Dans de grands mod\u00e8les, l&#8217;espace des solutions devient tellement vaste qu&#8217;il est plus facile de tomber sur des solutions simples et efficaces que sur des &#8220;pi\u00e8ges&#8221; compliqu\u00e9s.<\/p>\n<p>2) L&#8217;overfitting se produit si le mod\u00e8le est tr\u00e8s grand en comparaison des donn\u00e9es. Comme on augmente \u00e9galement le nombre de donn\u00e9es d&#8217;entra\u00eenement, il y a moins de possibilit\u00e9s d&#8217; &#8220;apprentissage par c\u0153ur&#8221;.<\/p>\n<p>&nbsp;<\/p>\n<p>Une question reste en suspens : est-ce qu&#8217;on atteint un nouveau palier, sans reprise cette fois-ci, si l&#8217;on grossit encore le mod\u00e8le ? Ou les techniques actuelles d&#8217;intelligence artificielle nous am\u00e8neront-elles \u00e0 des IA g\u00e9n\u00e9rales ?<\/p>\n<p>&nbsp;<\/p>\n<p>Source : vid\u00e9o d&#8217;Algorithmic Simplicity<\/p>\n<p><iframe loading=\"lazy\" title=\"THIS is why large language models can understand the world\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/UKcWu1l_UNw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p>Illustration g\u00e9n\u00e9r\u00e9e par chatGPT le 29 avril 2025 (apr\u00e8s plusieurs it\u00e9rations : j&#8217;avais du mal \u00e0 me faire comprendre !)<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Il y a quelques semaines, Algorithmic Simplicity a publi\u00e9 une vid\u00e9o s\u2019int\u00e9ressant \u00e0 un \u00e9trange paradoxe : plus un mod\u00e8le est gros, moins il devrait \u00eatre capable de g\u00e9n\u00e9raliser, et ce n&#8217;est pourtant pas ce qu&#8217;on constate. D&#8217;abord, pourquoi un mod\u00e8le gros devrait-il \u00eatre moins bon ? C&#8217;est peut \u00eatre \u00e7a qui vous paraitra paradoxal. &#8230; <a title=\"Le paradoxe des gros mod\u00e8les de langages\" class=\"read-more\" href=\"https:\/\/edu.ge.ch\/site\/tablettepedagogique\/2025\/04\/30\/le-paradoxe-des-gros-modeles-de-langages\/\" aria-label=\"En savoir plus sur Le paradoxe des gros mod\u00e8les de langages\">Lire la suite<\/a><\/p>\n","protected":false},"author":344,"featured_media":2984,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[374,332],"tags":[],"class_list":["post-2978","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ia","category-intelligence-artificielle"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le paradoxe des gros mod\u00e8les de langages - Le blog des formatrices et formateurs du SEM<\/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:\/\/edu.ge.ch\/site\/tablettepedagogique\/2025\/04\/30\/le-paradoxe-des-gros-modeles-de-langages\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Le paradoxe des gros mod\u00e8les de langages - Le blog des formatrices et formateurs du SEM\" \/>\n<meta property=\"og:description\" content=\"Il y a quelques semaines, Algorithmic Simplicity a publi\u00e9 une vid\u00e9o s\u2019int\u00e9ressant \u00e0 un \u00e9trange paradoxe : plus un mod\u00e8le est gros, moins il devrait \u00eatre capable de g\u00e9n\u00e9raliser, et ce n&#8217;est pourtant pas ce qu&#8217;on constate. 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D&#8217;abord, pourquoi un mod\u00e8le gros devrait-il \u00eatre moins bon ? C&#8217;est peut \u00eatre \u00e7a qui vous paraitra paradoxal. ... 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