Model Backend Abstraction With Lazy Loading

Gradio web UI for local LLMs with multiple backends.

Unique: Implements backend abstraction via Python duck typing (all backends expose generate() method) combined with lazy loading that defers backend initialization until first use, reducing startup time from 10s to <1s for model selection

vs others: More transparent than LangChain's LLM abstraction (direct access to backend objects), with lazy loading vs. eager initialization in most frameworks