Multi-Turn Reinforcement Learning on Amazon SageMaker AI: A hands-on guide

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Most fine-tuning teaches a model to produce a better answer to a single prompt. Agentic tasks are different. An agent that files an expense report or triages a support ticket takes a sequence of actions, and each step depends on what came before. There’s rarely one correct sequence to imitate, and the only reliable feedback is whether the whole sequence succeeded. Supervised fine-tuning has no labels for that, and single-turn reinforcement learning cannot credit a decision made three steps…