Grokking the AI System Design Interview

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Model Serving Basics

1. A Model in Production Is a Stateless Service

Strip the mystique first. A deployed predictive model is a stateless service, meaning it keeps no memory of past requests between calls. It loads a file into memory at startup and answers one kind of call: "here are the features, give me a score." Because it is stateless, everything you already know about scaling stateless services applies unchanged. Replicas behind a load balancer. Horizontal autoscaling on CPU or queue depth. Rolling deploys. Health checks

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