Gemma 4 pour une API de diagnostic de feuilles de maïs : un atelier pas à pas

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Un tutoriel de DEV Community présente la construction en 45 minutes d'une petite API nommée AgriScan, qui reçoit la photo d'une feuille de maïs et renvoie un diagnostic au format JSON. Le projet suit un guide sur le développement assisté par IA, couvrant les fichiers de contexte, le rangement des prompts, la sortie structurée et les tests. La requête passe par FastAPI, puis par le modèle Gemma 4 de Google, appelé via l'API Gemini, avant que la réponse JSON ne soit renvoyée. L'article précise les prérequis : Python 3.11 ou plus récent, Git, une clé d'API Gemini gratuite et quelques photos de test. Le maïs n'est qu'un exemple, les lecteurs étant invités à remplacer ce cas par leur propre problème.

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