[r/LocalLLaMA] Composable CFG grammars for llama.cpp (pygbnf)

Summary

The author created `pygbnf`, a new Python library, to address difficulties with constrained generation in local LLM experiments, specifically due to version mismatches with existing tools like `llama-cpp-python` and `Guidance`. Available via pip, `pygbnf` allows developers to define context-free grammars in a lightweight way, simplifying local experimentation with various structured outputs beyond just JSON.

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