{"id":14523,"date":"2022-12-15T12:15:15","date_gmt":"2022-12-15T11:15:15","guid":{"rendered":"https:\/\/www.freelance-engineering.fr\/blog\/?p=14523"},"modified":"2022-12-21T10:36:36","modified_gmt":"2022-12-21T09:36:36","slug":"construire-modele-machine-learning","status":"publish","type":"post","link":"https:\/\/www.freelance-engineering.fr\/blog\/construire-modele-machine-learning\/","title":{"rendered":"6 \u00e9tapes pour construire un mod\u00e8le de Machine Learning"},"content":{"rendered":"\n<p>Le <strong>Machine Learning<\/strong> ou l\u2019apprentissage automatique est une science informatique qui se concentre sur l\u2019analyse des donn\u00e9es et l\u2019utilisation des algorithmes pour <strong>cr\u00e9er des mod\u00e8les pr\u00e9dictifs<\/strong>. <\/p>\n\n\n\n<p>Il est utilis\u00e9 pour <strong>automatiser des t\u00e2ches<\/strong> et <strong>trouver des solutions aux probl\u00e8mes complexes<\/strong>. Un <strong>mod\u00e8le de Machine Learning<\/strong> permet aux logiciels de devenir plus pr\u00e9cis dans la pr\u00e9diction des r\u00e9sultats sans instruction manuelle. <\/p>\n\n\n\n<p>L\u2019aspect it\u00e9ratif du Machine Learning est important, car les mod\u00e8les sont expos\u00e9s \u00e0 de nouvelles informations qui leur permettent de <strong>modifier leur trajectoire de mani\u00e8re autonome<\/strong>. Ils peuvent <strong>s\u2019appuyer sur des calculs pr\u00e9c\u00e9dents pour g\u00e9n\u00e9rer des r\u00e9sultats fiables et reproductibles<\/strong>.<\/p>\n\n\n\n<p>Le processus de cr\u00e9ation d\u2019un mod\u00e8le d\u2019apprentissage automatique comprend six \u00e9tapes :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>l\u2019identification des besoins<\/li>\n\n\n\n<li>la collecte et la pr\u00e9paration des donn\u00e9es<\/li>\n\n\n\n<li>la configuration du mod\u00e8le<\/li>\n\n\n\n<li>l\u2019entra\u00eenement du mod\u00e8le<\/li>\n\n\n\n<li>l\u2019\u00e9valuation des performances<\/li>\n\n\n\n<li>le test et l\u2019ajustement du mod\u00e8le.<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">1. Identifier les besoins en Machine Learning<\/h2>\n\n\n\n<p>Avant de commencer \u00e0 travailler sur un mod\u00e8le d\u2019apprentissage automatique, il est important de <strong>comprendre le probl\u00e8me que vous essayez de r\u00e9soudre<\/strong>. <\/p>\n\n\n\n<p>Pour ce faire, vous devez <strong>identifier les besoins et les objectifs de votre entreprise <\/strong>et faire la distinction entre les donn\u00e9es exp\u00e9rimentales avec des r\u00e9sultats complets ou incomplets afin de d\u00e9cider si vous avez \u00e0 faire \u00e0 un probl\u00e8me supervis\u00e9 ou non supervis\u00e9.<\/p>\n\n\n\n<p>Il est important de comprendre <strong>quelles donn\u00e9es vous avez \u00e0 votre disposition<\/strong>, <strong>quels r\u00e9sultats vous souhaitez obtenir<\/strong> pour d\u00e9tecter au mieux les probl\u00e8mes \u00e0 r\u00e9soudre, par exemple :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>la r\u00e9gression (lin\u00e9aire et logistique), <\/li>\n\n\n\n<li>la classification, <\/li>\n\n\n\n<li>le regroupement, <\/li>\n\n\n\n<li>le classement, <\/li>\n\n\n\n<li>la cr\u00e9ation d\u2019un syst\u00e8me de recommandation<\/li>\n\n\n\n<li>la r\u00e9duction des dimensions. <\/li>\n<\/ul>\n\n\n\n<p>Vous devez \u00e9galement r\u00e9fl\u00e9chir \u00e0 la fa\u00e7on dont vous pouvez utiliser le Machine Learning pour atteindre ces objectifs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Collecter et pr\u00e9parer les bonnes donn\u00e9es<\/h2>\n\n\n\n<p>Une fois que vous avez identifi\u00e9 les besoins et les objectifs, vous pouvez commencer \u00e0<strong> recueillir et \u00e0 pr\u00e9parer les donn\u00e9es n\u00e9cessaires pour le mod\u00e8le<\/strong>. <\/p>\n\n\n\n<p>Il est essentiel que vous fournissiez aux machines des <strong>donn\u00e9es de qualit\u00e9<\/strong> pour commencer. C\u2019est primordial, car la qualit\u00e9 des donn\u00e9es qui entrent dans la machine aura <strong>une incidence directe sur la pr\u00e9cision du mod\u00e8le<\/strong>. <\/p>\n\n\n\n<p>Les donn\u00e9es doivent :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u00eatre appropri\u00e9es, <\/li>\n\n\n\n<li>comporter un minimum de valeurs manquantes ou r\u00e9p\u00e9t\u00e9es, <\/li>\n\n\n\n<li>et couvrir un bon \u00e9ventail des diff\u00e9rentes sous-cat\u00e9gories\/classes.<\/li>\n<\/ul>\n\n\n\n<p>Apr\u00e8s avoir recueilli les informations n\u00e9cessaires, il faut les traiter. Cela peut \u00eatre fait de la mani\u00e8re suivante&nbsp;:<br><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Rassemblez toutes les donn\u00e9es dont vous disposez et en les dispersant au hasard. <\/strong>Cela permet de s\u2019assurer que les donn\u00e9es sont r\u00e9parties de mani\u00e8re homog\u00e8ne et que l\u2019ordre n\u2019entrave pas le processus d\u2019apprentissage.<\/li>\n\n\n\n<li><strong>Supprimez toutes les donn\u00e9es ind\u00e9sirables, les valeurs vides ou r\u00e9p\u00e9t\u00e9es, la conversion des types de donn\u00e9es, etc.<\/strong> Il peut \u00eatre essentiel de r\u00e9organiser l\u2019ensemble de donn\u00e9es et de modifier les lignes et les colonnes.<\/li>\n\n\n\n<li><strong>Visualisez les donn\u00e9es<\/strong> pour comprendre leur structure et le lien entre les diff\u00e9rentes variables et classes pr\u00e9sentes.<\/li>\n\n\n\n<li><strong>Divisez les donn\u00e9es \u00e9pur\u00e9es en deux ensembles<\/strong>&nbsp;: un ensemble d\u2019entra\u00eenement \u00e0 partir duquel votre mod\u00e8le apprend, et un ensemble de tests pour v\u00e9rifier la pr\u00e9cision de votre mod\u00e8le.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">3. Configurer le mod\u00e8le d\u2019apprentissage automatique<\/h2>\n\n\n\n<p>Apr\u00e8s avoir appliqu\u00e9 un <strong>algorithme d\u2019apprentissage automatique<\/strong> aux donn\u00e9es compil\u00e9es, il est essentiel de <strong>choisir un mod\u00e8le appropri\u00e9 <\/strong>qui est li\u00e9 \u00e0 la t\u00e2che. <\/p>\n\n\n\n<p>Au fil des ans, les experts dans ce domaine ont cr\u00e9\u00e9 une multitude de mod\u00e8les applicables \u00e0 diverses t\u00e2ches telles que la reconnaissance vocale, la reconnaissance d\u2019images, la pr\u00e9diction, etc. E<\/p>\n\n\n\n<p>n outre, il est essentiel de d\u00e9terminer si votre mod\u00e8le est con\u00e7u pour des <strong>donn\u00e9es num\u00e9riques ou cat\u00e9gorielles<\/strong> et de faire la s\u00e9lection appropri\u00e9e.<\/p>\n\n\n\n<p>La configuration du mod\u00e8le comprend la s\u00e9lection des bonnes m\u00e9thodes d\u2019apprentissage et des hyperparam\u00e8tres appropri\u00e9s. Les <strong>hyperparam\u00e8tres<\/strong> sont des variables qui contr\u00f4lent le comportement du mod\u00e8le et qui doivent \u00eatre ajust\u00e9es pour obtenir les meilleurs r\u00e9sultats. Vous devez choisir le type d\u2019algorithme \u00e0 utiliser et d\u00e9cider s\u2019il s\u2019agit d\u2019une t\u00e2che d\u2019apprentissage supervis\u00e9 ou non supervis\u00e9. Vous devez \u00e9galement d\u00e9finir le nombre d\u2019it\u00e9rations et le nombre de fonctionnalit\u00e9s \u00e0 utiliser.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Entra\u00eener le mod\u00e8le de Machine Learning<\/h2>\n\n\n\n<p>Une fois que le mod\u00e8le est configur\u00e9, vous pouvez commencer \u00e0 l\u2019entra\u00eener. Cela implique l\u2019utilisation des donn\u00e9es pour apprendre les param\u00e8tres du mod\u00e8le. Les donn\u00e9es pr\u00e9par\u00e9es et transmises \u00e0 votre mod\u00e8le vont lui permettre de faire des pr\u00e9dictions.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>L\u2019essai de training est consid\u00e9r\u00e9 comme la partie la plus importante de l\u2019apprentissage automatique. <\/p>\n<\/blockquote>\n\n\n\n<p>Le mod\u00e8le re\u00e7oit des donn\u00e9es et, au cours d\u2019une p\u00e9riode donn\u00e9e, il est entra\u00een\u00e9 pour augmenter progressivement sa capacit\u00e9 \u00e0 r\u00e9pondre \u00e0 une situation particuli\u00e8re, \u00e0 r\u00e9soudre une difficult\u00e9 complexe ou \u00e0 effectuer un travail. Il est sugg\u00e9r\u00e9 d\u2019utiliser des<strong> donn\u00e9es d\u2019entra\u00eenement \u00ab training set \u00bb<\/strong> pour cette \u00e9tape.<\/p>\n\n\n\n<p>La compilation compl\u00e8te des informations collect\u00e9es est souvent trop lourde et consommatrice de ressources&nbsp;: il est alors ad\u00e9quat de<strong> choisir une fraction de l\u2019ensemble de donn\u00e9es <\/strong>pour entra\u00eener le mod\u00e8le plus efficacement et am\u00e9liorer ses pr\u00e9visions. Pensez \u00e0 choisir <strong>un \u00e9chantillon qui soit caract\u00e9ristique de vos donn\u00e9es<\/strong>, sinon vous risquez de cr\u00e9er une inclinaison.<\/p>\n\n\n\n<p>Au fil du temps, vous pouvez utiliser des techniques d\u2019optimisation pour trouver les meilleurs param\u00e8tres et ajuster le mod\u00e8le pour obtenir des r\u00e9sultats optimaux. Une fois que le mod\u00e8le est entra\u00een\u00e9, vous pouvez passer \u00e0 l\u2019\u00e9tape suivante.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">5. \u00c9valuer les performances du mod\u00e8le<\/h2>\n\n\n\n<p>Une fois que le mod\u00e8le est entra\u00een\u00e9, vous devez \u00e9valuer sa performance.<strong> L\u2019\u00e9valuation d\u2019un mod\u00e8le de Machine Learning <\/strong>consiste \u00e0 jauger ses m\u00e9triques, sa matrice de confusion, ses indicateurs de performance cl\u00e9 et la qualit\u00e9 du mod\u00e8le, puis \u00e0 v\u00e9rifier s\u2019il peut atteindre les objectifs commerciaux fix\u00e9s.<\/p>\n\n\n\n<p>Pour cela, vous devez&nbsp;: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>l\u2019\u00e9valuer avec un ensemble de donn\u00e9es et une technique de validation\u2009; <\/li>\n\n\n\n<li>calculer la matrice de confusion dans le cas d\u2019une t\u00e2che de classification\u2009; <\/li>\n\n\n\n<li>utiliser des techniques de validation crois\u00e9e si l\u2019approche k-fold est adopt\u00e9e\u2009; <\/li>\n\n\n\n<li>modifier les hyperparam\u00e8tres pour maximiser ses performances\u2009; <\/li>\n\n\n\n<li>et comparer le mod\u00e8le avec un mod\u00e8le de r\u00e9f\u00e9rence. <\/li>\n<\/ul>\n\n\n\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img decoding=\"async\" width=\"1000\" height=\"563\" src=\"https:\/\/www.freelance-engineering.fr\/blog\/wp-content\/uploads\/2022\/12\/closeup-of-programer-hands-typing-machine-learning-2022-07-12-15-04-31-utc.jpg\" alt=\"\" class=\"wp-image-14526 size-full\" srcset=\"https:\/\/www.freelance-engineering.fr\/blog\/wp-content\/uploads\/2022\/12\/closeup-of-programer-hands-typing-machine-learning-2022-07-12-15-04-31-utc.jpg 1000w, https:\/\/www.freelance-engineering.fr\/blog\/wp-content\/uploads\/2022\/12\/closeup-of-programer-hands-typing-machine-learning-2022-07-12-15-04-31-utc-300x169.jpg 300w, https:\/\/www.freelance-engineering.fr\/blog\/wp-content\/uploads\/2022\/12\/closeup-of-programer-hands-typing-machine-learning-2022-07-12-15-04-31-utc-768x432.jpg 768w, https:\/\/www.freelance-engineering.fr\/blog\/wp-content\/uploads\/2022\/12\/closeup-of-programer-hands-typing-machine-learning-2022-07-12-15-04-31-utc-380x214.jpg 380w, https:\/\/www.freelance-engineering.fr\/blog\/wp-content\/uploads\/2022\/12\/closeup-of-programer-hands-typing-machine-learning-2022-07-12-15-04-31-utc-800x450.jpg 800w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p>Vous pouvez utiliser des m\u00e9triques telles que le rappel et la pr\u00e9cision pour mesurer la performance du mod\u00e8le. Vous devez \u00e9galement vous assurer que le mod\u00e8le n\u2019est pas surajust\u00e9 et qu\u2019il fonctionne bien avec des donn\u00e9es r\u00e9elles.<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">6. Tester et ajuster le mod\u00e8le de Machine Learning<\/h2>\n\n\n\n<p>La derni\u00e8re \u00e9tape de l\u2019apprentissage automatique consiste \u00e0 <strong>examiner le mod\u00e8le dans des conditions r\u00e9elles<\/strong>. Au cours de cette phase d\u2019\u00e9valuation, nous utilisons l\u2019ensemble de donn\u00e9es de test. Cela permet d\u2019affiner le mod\u00e8le gr\u00e2ce aux situations ou aux donn\u00e9es que l\u2019ordinateur n\u2019a pas encore rencontr\u00e9es lors de la phase d\u2019apprentissage. De cette mani\u00e8re, vous pourrez \u00e9valuer l\u2019efficacit\u00e9 et la comp\u00e9tence du mod\u00e8le dans le contexte de votre entreprise.<\/p>\n\n\n\n<p>Il est donc pr\u00e9f\u00e9rable de planifier les besoins futurs pour am\u00e9liorer l\u2019efficacit\u00e9 du mod\u00e8le, l\u2019extension de l\u2019entra\u00eenement pour ajouter de nouvelles capacit\u00e9s, am\u00e9liorer les performances et l\u2019exactitude du mod\u00e8le et augmenter les performances op\u00e9rationnelles.<\/p>\n\n\n\n<p>Consid\u00e9rez ce qui est efficace dans votre mod\u00e8le, ce qui doit \u00eatre am\u00e9lior\u00e9 et ce qui est en cours de d\u00e9veloppement. <\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>La m\u00e9thode la plus efficace pour construire un mod\u00e8le de Machine Learning consiste \u00e0 rechercher constamment des moyens de l\u2019am\u00e9liorer et de r\u00e9pondre efficacement \u00e0 l\u2019\u00e9volution des besoins de l\u2019entreprise.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p>Bien que l&rsquo;apprentissage automatique puisse \u00eatre un outil inestimable entre les mains d&rsquo;un data scientist comp\u00e9tent, il est important de se rappeler que la qualit\u00e9 du mod\u00e8le d\u00e9pend des donn\u00e9es que vous lui fournissez. Il est donc primordial de ne pas n\u00e9gliger les \u00e9tapes list\u00e9es ci-dessus car chacune d\u2019elle contribuera au succ\u00e8s de votre mod\u00e8le de Machine Learning.<\/p>\n\n\n\n<p>Chez <a href=\"https:\/\/www.freelance-engineering.fr\/\">Freelance Engineering<\/a>, notre mission est de <strong>fournir aux entreprises un r\u00e9seau fiable et flexible de professionnels de l&rsquo;ing\u00e9nierie exp\u00e9riment\u00e9s<\/strong>, leur permettant d&rsquo;<strong>acc\u00e9der \u00e0 l&rsquo;expertise<\/strong> dont elles ont besoin pour <strong>mener \u00e0 bien leurs projets avec succ\u00e8s et efficacit\u00e9<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"Le Machine Learning ou l\u2019apprentissage automatique est une science informatique qui se concentre sur l\u2019analyse des donn\u00e9es et&hellip;\n","protected":false},"author":2,"featured_media":14525,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7],"tags":[],"class_list":{"0":"post-14523","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-industrie","8":"cs-entry","9":"cs-video-wrap"},"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.4 - 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