Yiwei Chen

Who Built This Model? Tracing LLM Lineage via Spectral Fingerprints in Weight Space

This work investigates the notion of LLM"biometrics" to ask whether LLMs exhibit intrinsic fingerprints in weight space alone, without access to input data, that reveal their origin and lineage, and proposes a unified geometric fingerprinting framework that analyzes weight matrices from two complementary perspectives.