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Finite State Machine Constrained JSON Grammar Decoder

Problem Overview

Connecting LLMs to production microservices requires 100% reliable structured output. Constrained Decoding converts JSON Schemas into Finite State Machines (FSMs) that dynamically mask invalid token logits to $- \infty$ .

In this capstone, you will implement an FSM Constrained JSON Grammar Decoder that enforces valid schema transitions for strings, integers, enums, and objects.

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