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#spectral methods

1 story tagged spectral methods.

Phase transition chart showing probe accuracy stable above 500 samples then collapsing sharply below, with Fisher estimation error crossing the eigengap threshold, illustrating linear bias probe failure in LLM representations

Linear bias probes fail LLMs at specific sample sizes

Linear bias probes in LLM representations fail predictably when Fisher estimation error exceeds the eigengap, a spectral condition that makes probe instability diagnosable before deployment.

Lars Cornelissen · Sep 22, 2026