{"id":7617,"date":"2017-07-19T17:12:31","date_gmt":"2017-07-19T15:12:31","guid":{"rendered":"https:\/\/golem.ai\/blog\/nlp-fonctionnement-complexe\/"},"modified":"2022-04-22T14:19:38","modified_gmt":"2022-04-22T12:19:38","slug":"nlp-fonctionnement-complexe","status":"publish","type":"post","link":"https:\/\/miralia.ai\/fr\/blog\/linguistique\/nlp-fonctionnement-complexe","title":{"rendered":"Le langage naturel et sa complexit\u00e9"},"content":{"rendered":"<h3>Pratiqu\u00e9 au quotidien par tous, le langage nous est intuitif et normal. Pourtant, les machines peinent encore \u00e0 nous comprendre compl\u00e8tement. Pourquoi tant de d\u00e9fis dans la compr\u00e9hension informatique du langage humain ?<\/h3>\n<p>Les utopies que nous offrent la Science Fiction nous pr\u00e9sentent souvent des mondes technologiques dans lesquels les interactions homme-machines sont grandement fluidifi\u00e9es par des interfaces plus intuitives : Les gestes, la pens\u00e9e, et probablement le plus courant : le langage.<\/p>\n<h2><span style=\"color: #943b44;\">Qu\u2019est ce que le NLP ?<\/span><\/h2>\n<p>Le domaine de connaissance qui consiste \u00e0 cr\u00e9er des&nbsp;<strong>programmes informatiques capables de manipuler le langage humain<\/strong>&nbsp;s\u2019appelle le \u201cTraitement automatique du langage naturel\u201d ou parfois simplement \u201cTraitement automatique des langues\u201d.<\/p>\n<p>On lui pr\u00e9f\u00e8re le terme Anglais \u201c<em>Natural Language Processing<\/em>\u201d, qu\u2019on abr\u00e8ge&nbsp;<strong>NLP<\/strong>.<\/p>\n<h2><span style=\"color: #943b44;\">Qu\u2019est ce que le langage naturel ?<\/span><\/h2>\n<p>Le langage naturel est le terme pr\u00e9cis pour d\u00e9signer le langage humain, dont l\u2019\u00e9tude est la linguistique.<br>\n<strong>Par opposition<\/strong>&nbsp;au langage naturel, on parle de&nbsp;<strong>langage formel<\/strong>&nbsp;pour d\u00e9signer les syst\u00e8mes d\u2019\u00e9critures bien d\u00e9finis, comme les&nbsp;<strong>\u00e9critures math\u00e9matiques<\/strong>&nbsp;ou le&nbsp;<strong>code informatique<\/strong>.<\/p>\n<h2><span style=\"color: #943b44;\">Une complexit\u00e9 \u00e0 plusieurs visages<\/span><\/h2>\n<p>Le langage naturel est plus difficile \u00e0 traiter pour une machine, en voici quelques raisons simples :<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">Des \u00e9l\u00e9ments trompeurs<\/span><\/h3>\n<p>Les mots sont souvent&nbsp;<strong>polys\u00e9miques<\/strong>&nbsp;(plusieurs significations).<\/p>\n<p>\u201cIl n\u2019y a&nbsp;personne.\u201d \u201cIl y a encore une&nbsp;personne.\u201d<\/p>\n<p>Ici, le m\u00eame mot d\u00e9crit une&nbsp;affirmation&nbsp;et sa&nbsp;n\u00e9gation.<\/p>\n<p>Ou encore : \u00ab\u00a0douter&nbsp;de quelque chose\u00a0\u00bb. \u00ab\u00a0se&nbsp;douter&nbsp;de quelque chose\u00a0\u00bb.<\/p>\n<h3><\/h3>\n\n\n<\/h3>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter is-resized\"><a href=\"https:\/\/golem.ai\/fr\/ressources\/\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-12234 aligncenter\" src=\"https:\/\/golem-ai-website-wordpress-prod.s3.fr-par.scw.cloud\/wp-content\/uploads\/2022\/03\/26173514\/Contenus.png\" alt=\"\" width=\"480\" height=\"270\" srcset=\"https:\/\/golem-ai-website-wordpress-prod.s3.fr-par.scw.cloud\/wp-content\/uploads\/2022\/03\/26173514\/Contenus-300x169.png 300w, https:\/\/golem-ai-website-wordpress-prod.s3.fr-par.scw.cloud\/wp-content\/uploads\/2022\/03\/26173514\/Contenus-768x432.png 768w, https:\/\/golem-ai-website-wordpress-prod.s3.fr-par.scw.cloud\/wp-content\/uploads\/2022\/03\/26173514\/Contenus-18x10.png 18w, https:\/\/golem-ai-website-wordpress-prod.s3.fr-par.scw.cloud\/wp-content\/uploads\/2022\/03\/26173514\/Contenus.png 960w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/a><\/figure>\n<\/div>\n<h3>\n\n\n\n<h3><span style=\"color: #943b44;\">Des ambigu\u00eft\u00e9s<\/span><\/h3>\n<p>Une m\u00eame phrase peut vouloir dire quelque chose et son contraire.<br>\n\u201cIl y a plus de pain\u201d<br>\nCette forme est&nbsp;<strong>courante<\/strong>&nbsp;bien que&nbsp;<strong>grammaticalement incorrecte<\/strong>.<br>\nSi on souhaite pr\u00e9ciser le manque de pain, il faudrait \u00e9crire : \u201cIl n\u2019y a plus de pain\u201d.<br>\nPeut-on exiger de la part d\u2019un utilisateur, une grammaire stricte plut\u00f4t que les d\u00e9formations parfois plus utilis\u00e9es ?<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">N\u00e9cessit\u00e9 du contexte<\/span><\/h3>\n<p>\u201cIl voulait la voir.\u201d Qui veut voir qui ? C\u2019est ce qu\u2019on appelle une anaphore.<br>\nIl peut s\u2019agir d\u2019une r\u00e9f\u00e9rence \u00e0 une autre phrase, ou bien au contexte d\u2019utilisation : une autre personne dans la pi\u00e8ce par exemple<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">L\u2019insuffisance, parfois, du contexte<\/span><\/h3>\n<p>\u201cL\u2019\u00e9tudiant alla voir le prof \u00e0 la fin du cours, car il voulait lui parler.\u201d Nous avons bien les deux personnes en pr\u00e9sence, mais qui veut parler \u00e0 qui ?<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">Le probl\u00e8me de l\u2019orthographe<\/span><\/h3>\n<p>L\u2019orthographe d\u2019un mot est influenc\u00e9e par d\u2019autres mots (Conjugaison, genre, etc.), qui permet r\u00e9ciproquement, de d\u00e9sambigu\u00efser certaines situations.<br>\nCette possibilit\u00e9 \u00e9tant conditionn\u00e9e par la justesse grammaticale et orthographique de la phrase !<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">Des relations complexes entre les mots<\/span><\/h3>\n<p>Un mot peut avoir deux synonymes qui sont antonymes entre eux : \u201cHomme\u201d &lt;- \u201cHumain\u201d -&gt; \u201cFemme\u201d<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">Le langage change en permanence<\/span><\/h3>\n<p>Les nouveaux usages deviennent des&nbsp;<strong>n\u00e9ologismes<\/strong>, l\u00e0 o\u00f9 d\u2019anciennes expressions disparaissent des usages. Le langage mute en permanence : Le langage commun influence l\u2019usage, mais \u00e9galement, l\u2019usage influence le langage commun.<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">Le probl\u00e8me de l\u2019universalit\u00e9<\/span><\/h3>\n<p>D\u2019une langue \u00e0 l\u2019autre, \u00e9videmment, la plupart des r\u00e8gles grammaticales varie.<br>\nM\u00eame dans une seule langue, la&nbsp;signification d\u2019un mot peut \u00eatre sujette aux variations culturelles.<\/p>\n<h3><\/h3>\n<h3><span style=\"color: #943b44;\">L\u2019absurde<\/span><\/h3>\n<p>On peut par exemple construire des phrases auto-r\u00e9f\u00e9rentielles, qui ne peuvent avoir aucune interpr\u00e9tation compl\u00e8te correcte.<br>\n\u201cCette phrase est fausse.\u201d<\/p>\n<h2><span style=\"color: #943b44;\">Sortir de la complexit\u00e9 ?<\/span><\/h2>\n<p>De ce point de vue, le langage semble \u00eatre un probl\u00e8me infiniment complexe, voir insoluble. Alors, comment est-il possible malgr\u00e9 tout d\u2019avoir d\u00e9j\u00e0 aujourd\u2019hui des interfaces homme-machines par le langage ?<\/p>\n<p>Plusieurs \u00e9l\u00e9ments de r\u00e9ponse :<\/p>\n<ul>\n<li>On ne s\u2019adresse pas spontan\u00e9ment \u00e0 une machine exactement comme \u00e0 une personne. Les recherches Google en sont un bon exemple. Et donc, la complexit\u00e9 r\u00e9elle d\u2019une demande adress\u00e9e \u00e0 un logiciel est moins importante.&nbsp;Les utilisateurs ne feront pas r\u00e9f\u00e9rence \u00e0 un \u00e9l\u00e9ment de contexte auquel ils supposent que le logiciel n\u2019a pas acc\u00e8s.<\/li>\n<li>Malgr\u00e8 toutes les variations d\u2019une langue \u00e0 l\u2019autre, on retrouve quelques r\u00e8gles communes. D\u2019autre part, il y a des familles de langues dont les r\u00e8gles sont tr\u00e8s proches.<\/li>\n<li>Enfin,&nbsp;<em>\u201ccomprendre le langage\u201d<\/em>&nbsp;est rarement un but en soi. Il s\u2019agit par exemple de construire une repr\u00e9sentation d\u2019une phrase, de r\u00e9sumer ou de traduire un texte. Dans le cas de Golem.ai, il s\u2019agit de transformer la phrase en action. Chacune de ces perspectives permet d\u2019ignorer certains aspects du langage, peu ou pas pertinents.<\/li>\n<\/ul>\n<p><small>Certains de ces exemples sont inspir\u00e9s du livre&nbsp;<em>\u201cLe langage et la pens\u00e9e\u201d<\/em>&nbsp;de Noam Chomsky, r\u00e9\u00e9dition Payot parue en 2009.<\/small><\/p><!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Quels sont les d\u00e9fis \u00e0 relever dans le traitement automatique des langages humains ?<!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":1,"featured_media":7619,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"content-type":"","footnotes":""},"categories":[68,31],"tags":[],"class_list":["post-7617","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-linguistique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le langage naturel et sa complexit\u00e9<\/title>\n<meta name=\"description\" content=\"Quels sont les d\u00e9fis \u00e0 relever dans le traitement automatique des langages humains ?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/miralia.ai\/fr\/blog\/linguistique\/nlp-fonctionnement-complexe\/\" \/>\n<meta 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