Fathom: Cognitive geometry of LLM reasoning via SAE feature coherence. Spectrum analysis (Gini AUC=0.685), cognitive autopsy (layer 11 = 63% fault epicenter), cross-architecture (Gemma + Llama). ICML 2026.
sparse-autoencoders mechanistic-interpretability hallucination-detection transformer-internals cognitive-measurement
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Apr 11, 2026 - Python