Fast JSON Decoding for Local LLMs with Compressed FSM

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How It Works

The compressed finite state machine (FSM) approach enables faster JSON and regex constrained decoding for local LLMs.

• Compresses the FSM transitions to reduce memory and lookup overhead
• Integrates with SGLang runtime
• Achieves significant speedups over naive implementations

Links

• Blog post on LMSYS
• Code on GitHub

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