Chopper

About

Chopper is a small mmBERT encoder that reads a question and 20 retrieved snippets in one pass and marks each word keep or drop, producing short exact-quote excerpts for RAG context. The README reports about 50 ms per question on an RTX 3090 and compares Qwen3-14B answers from full snippets, chopper excerpts and Claude Opus 5.5 excerpts on 400 MuSiQue questions. The repository includes an operator script and a demo.