{"id":2288,"date":"2026-04-25T10:53:10","date_gmt":"2026-04-25T08:53:10","guid":{"rendered":"https:\/\/askem.eu\/?p=2288"},"modified":"2026-04-25T10:53:16","modified_gmt":"2026-04-25T08:53:16","slug":"dspy-programmer-ses-prompts-au-lieu-de-les-ecrire","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/04\/25\/dspy-programmer-ses-prompts-au-lieu-de-les-ecrire\/","title":{"rendered":"DSPy : programmer ses prompts au lieu de les \u00e9crire"},"content":{"rendered":"<h2 class=\"wp-block-heading\">DSPy&nbsp;: programmer ses prompts au lieu de les \u00e9crire<\/h2>\n\n\n\n<p>Tous ceux qui construisent des pipelines LLM finissent par buter sur le m\u00eame mur&nbsp;: les prompts. On les \u00e9crit \u00e0 la main, on les copie-colle, on les bricole jusqu&rsquo;\u00e0 ce que  \u00ab&nbsp;\u00e7a marche \u00e0 peu pr\u00e8s&nbsp;\u00bb, puis le mod\u00e8le change, ou la t\u00e2che d\u00e9rive et tout est \u00e0 refaire. <strong><a href=\"https:\/\/dspy.ai\">DSPy<\/a><\/strong>, projet open source issu de l&rsquo;universit\u00e9 de Stanford (Apache 2.0), propose un changement de paradigme&nbsp;: traiter les prompts comme du code, avec des <em>signatures<\/em> typ\u00e9es, des <em>modules<\/em> composables, et un <em>compilateur<\/em> qui optimise automatiquement les prompts et les exemples few-shot pour atteindre une m\u00e9trique cible.<\/p>\n\n\n\n<p>Dans une stack IA souveraine (Ollama, vLLM, LiteLLM, LangGraph, pgvector\u2026), DSPy vient combler une brique absente du site jusqu&rsquo;ici&nbsp;: la discipline d&rsquo;ing\u00e9nierie des prompts, sur le m\u00eame mod\u00e8le que scikit-learn a disciplin\u00e9 le machine learning classique.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Le principe&nbsp;: s\u00e9parer la logique et le prompt<\/h2>\n\n\n\n<p>Au lieu d&rsquo;\u00e9crire quelque chose comme  \u00ab&nbsp;Tu es un assistant expert qui\u2026 r\u00e9ponds de mani\u00e8re concise\u2026 au format JSON\u2026 voici un exemple\u2026&nbsp;\u00bb, on d\u00e9clare une <strong>signature<\/strong>&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">import dspy\n\nclass ClassifierUnRapport(dspy.Signature):\n    \"\"\"Classe un rapport technique dans une des cat\u00e9gories m\u00e9tier.\"\"\"\n    texte: str = dspy.InputField(desc=\"Contenu brut du rapport\")\n    categorie: str = dspy.OutputField(desc=\"Cat\u00e9gorie parmi&nbsp;: infrastructure, data, IA, gouvernance\")\n    justification: str = dspy.OutputField(desc=\"Une phrase expliquant le choix\")\n\nclassifier = dspy.ChainOfThought(ClassifierUnRapport)\nresultat = classifier(texte=mon_rapport)\n<\/pre>\n\n\n\n<p>DSPy g\u00e9n\u00e8re lui-m\u00eame le prompt en fonction du mod\u00e8le utilis\u00e9, ins\u00e8re les champs, force le format, et int\u00e8gre automatiquement une cha\u00eene de raisonnement (<code>ChainOfThought<\/code>) ou d&rsquo;autres strat\u00e9gies (<code>ReAct<\/code>, <code>ProgramOfThought<\/code>, <code>MultiChainComparison<\/code>\u2026). On d\u00e9crit <em>quoi<\/em> faire, DSPy s&rsquo;occupe du <em>comment<\/em>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">L&rsquo;optimiseur&nbsp;: le vrai saut qualitatif<\/h2>\n\n\n\n<p>L\u00e0 o\u00f9 DSPy devient int\u00e9ressant, c&rsquo;est son <strong>compilateur<\/strong>. \u00c0 partir de quelques dizaines d&rsquo;exemples d&rsquo;entra\u00eenement et d&rsquo;une fonction de score (pr\u00e9cision, F1, BLEU, ou une m\u00e9trique maison, m\u00eame un autre LLM qui juge), DSPy optimise&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>les <strong>instructions<\/strong> du prompt (MIPROv2, COPRO)&nbsp;;<\/li>\n\n\n\n<li>les <strong>exemples few-shot<\/strong> s\u00e9lectionn\u00e9s dans le jeu d&rsquo;entra\u00eenement (BootstrapFewShot)&nbsp;;<\/li>\n\n\n\n<li>et m\u00eame, sur un petit mod\u00e8le, les <strong>poids<\/strong> par fine-tuning (BootstrapFinetune).<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">from dspy.teleprompt import MIPROv2\n\ndef score(exemple, prediction, trace=None):\n    return exemple.categorie == prediction.categorie\n\noptimiseur = MIPROv2(metric=score, auto=\"medium\")\nclassifier_optimise = optimiseur.compile(\n    classifier,\n    trainset=exemples_train,\n    valset=exemples_val,\n)\nclassifier_optimise.save(\"classifier_v1.json\")\n<\/pre>\n\n\n\n<p>R\u00e9sultat concret&nbsp;: sur des t\u00e2ches r\u00e9elles (classification, QA, extraction), l&rsquo;optimisation automatique gagne typiquement 5 \u00e0 20 points de m\u00e9trique par rapport \u00e0 un prompt \u00e9crit \u00e0 la main, et surtout rend la d\u00e9marche <strong>reproductible<\/strong> et <strong>versionnable<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Int\u00e9gration dans une stack open source<\/h2>\n\n\n\n<p>DSPy est agnostique du mod\u00e8le. Via <code>dspy.LM<\/code>, il s&rsquo;appuie sur LiteLLM pour cibler indiff\u00e9remment un Ollama local, un vLLM auto-h\u00e9berg\u00e9, ou un fournisseur cloud&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"># Ollama local\ndspy.configure(lm=dspy.LM(\"ollama_chat\/qwen2.5:14b\", api_base=\"http:\/\/localhost:11434\"))\n\n# vLLM via LiteLLM\ndspy.configure(lm=dspy.LM(\"hosted_vllm\/Qwen2.5-32B-Instruct\", api_base=\"http:\/\/vllm:8000\/v1\"))\n<\/pre>\n\n\n\n<p>Le couplage naturel avec les briques d\u00e9j\u00e0 couvertes sur askem.eu&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/04\/09\/langgraph-construire-des-agents-ia-autonomes-avec-orchestration-memoire-et-outils\/\" type=\"post\" id=\"2212\">LangGraph<\/a><\/strong> pour l&rsquo;orchestration d&rsquo;agents&nbsp;: DSPy fournit les \u00e9tapes  \u00ab&nbsp;intelligentes&nbsp;\u00bb compil\u00e9es, LangGraph g\u00e8re la machine d&rsquo;\u00e9tat.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/04\/13\/outlines-forcer-les-llm-open-source-a-produire-du-json-structure-en-production\/\" type=\"post\" id=\"2242\">Outlines<\/a><\/strong> pour le for\u00e7age de format&nbsp;: DSPy structure les sorties via ses signatures, Outlines garantit la validit\u00e9 JSON au niveau du d\u00e9codage.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/04\/11\/pgvector-la-recherche-vectorielle-dans-postgresql-pour-un-rag-sans-brique-supplementaire\/\" type=\"post\" id=\"2239\">pgvector<\/a> \/ <a href=\"https:\/\/askem.eu\/en\/2026\/04\/01\/qdrant-base-vectorielle-open-source-pour-le-rag-et-la-recherche-semantique\/\" type=\"post\" id=\"2159\">Qdrant<\/a><\/strong> pour le retrieval&nbsp;: DSPy a un <code>Retrieve<\/code> de s\u00e9rie qui se branche sur n&rsquo;importe quel backend.<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/askem.eu\/en\/2026\/04\/02\/langfuse-observer-et-evaluer-ses-pipelines-llm-open-source-en-production\/\" type=\"post\" id=\"2162\">Langfuse<\/a><\/strong> pour l&rsquo;observabilit\u00e9&nbsp;: la trace compl\u00e8te des appels DSPy est compatible OpenTelemetry.<\/li>\n\n\n\n<li><strong>RAGAS<\/strong> ou un juge LLM comme m\u00e9trique dans l&rsquo;optimiseur&nbsp;: boucler \u00e9valuation et compilation.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Quand DSPy apporte et quand il est de trop<\/h2>\n\n\n\n<p>DSPy brille dans des situations pr\u00e9cises&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pipelines LLM r\u00e9currents et critiques, qui doivent rester stables quand le mod\u00e8le change&nbsp;;<\/li>\n\n\n\n<li>t\u00e2ches o\u00f9 l&rsquo;on dispose d&rsquo;une m\u00e9trique automatisable (classification, extraction, QA avec v\u00e9rit\u00e9 terrain, tri de tickets\u2026)&nbsp;;<\/li>\n\n\n\n<li>portage d&rsquo;un prototype bricol\u00e9 vers quelque chose de production-grade&nbsp;;<\/li>\n\n\n\n<li>comparaison objective de plusieurs mod\u00e8les open source sur la m\u00eame t\u00e2che.<\/li>\n<\/ul>\n\n\n\n<p>\u00c0 l&rsquo;inverse, DSPy apporte peu pour des prompts ponctuels, conversationnels ou cr\u00e9atifs sans m\u00e9trique claire. Il n&rsquo;est pas un remplacement d&rsquo;un framework d&rsquo;agent comme LangGraph&nbsp;: il compl\u00e8te, il n&rsquo;orchestre pas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Points de vigilance<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Co\u00fbt d&rsquo;optimisation<\/strong>&nbsp;: la compilation consomme des appels LLM. Pr\u00e9voir un budget ou compiler contre un mod\u00e8le local avant d&rsquo;aller en production.<\/li>\n\n\n\n<li><strong>Taille du jeu de validation<\/strong>&nbsp;: en dessous de 50 exemples fiables, l&rsquo;optimiseur sur-apprend. Investir dans un jeu de tests propre est un pr\u00e9requis, pas un luxe.<\/li>\n\n\n\n<li><strong>Versionner l&rsquo;optimis\u00e9<\/strong>&nbsp;: <code>compiled.save(\"v1.json\")<\/code> produit un artefact reproductible \u00e0 commiter comme un mod\u00e8le ML classique.<\/li>\n\n\n\n<li><strong>Observabilit\u00e9<\/strong>&nbsp;: activer le tracing Langfuse d\u00e8s le d\u00e9but&nbsp;: un pipeline DSPy en production reste une bo\u00eete \u00e0 prompts qu&rsquo;on a int\u00e9r\u00eat \u00e0 inspecter.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Pour commencer<\/h2>\n\n\n\n<pre class=\"wp-block-preformatted\">pip install dspy\n<\/pre>\n\n\n\n<p>Les <em>tutorials<\/em> officiels couvrent un pipeline RAG complet, la classification et l&rsquo;extraction structur\u00e9e \u2014 tous reproductibles en local avec Ollama en moins d&rsquo;une heure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ressources<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/dspy.ai\" target=\"_blank\" rel=\"noreferrer noopener\">dspy.ai<\/a> \u2014 site officiel, documentation et tutoriels.<\/li>\n\n\n\n<li><a href=\"https:\/\/github.com\/stanfordnlp\/dspy\" target=\"_blank\" rel=\"noreferrer noopener\">stanfordnlp\/dspy<\/a> \u2014 d\u00e9p\u00f4t GitHub (Apache 2.0).<\/li>\n\n\n\n<li>Publication fondatrice&nbsp;: <em>DSPy: Compiling Declarative Language Model Calls into Self-Improving Pipelines<\/em>, Khattab et al., ICLR 2024.<\/li>\n<\/ul>\n\n\n\n<p>\u00c0 retenir&nbsp;: DSPy ne remplace pas un bon prompt, il remplace la culture artisanale du prompt par une culture d&rsquo;ing\u00e9nierie. Dans une stack IA souveraine, c&rsquo;est la brique qui transforme la question  \u00ab&nbsp;est-ce que \u00e7a marche&nbsp;?&nbsp;\u00bb en  \u00ab&nbsp;est-ce que c&rsquo;est au-dessus du seuil&nbsp;?&nbsp;\u00bb.<\/p>","protected":false},"excerpt":{"rendered":"<p>DSPy&nbsp;: programmer ses prompts au lieu de les \u00e9crire Tous ceux qui construisent des pipelines LLM finissent par buter sur le m\u00eame mur&nbsp;: les prompts. On les \u00e9crit \u00e0 la main, on les copie-colle, on les bricole jusqu&rsquo;\u00e0 ce que \u00ab&nbsp;\u00e7a marche \u00e0 peu pr\u00e8s&nbsp;\u00bb, puis le mod\u00e8le change, ou la t\u00e2che d\u00e9rive et tout [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2289,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[16],"tags":[],"class_list":["post-2288","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ai","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>DSPy : programmer ses prompts au lieu de les \u00e9crire - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D&#039;\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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