GPT-2 Small's terminal MLP implements a legible three-tier exception handler with 27 named neurons that routes predictions, while previously identified knowledge neurons function as amplifiers of residual-stream signals rather than fact storage.
Ian Tenney, Dipanjan Das, and Ellie Pavlick
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Darkness Visible: Reading the Exception Handler of a Language Model
GPT-2 Small's terminal MLP implements a legible three-tier exception handler with 27 named neurons that routes predictions, while previously identified knowledge neurons function as amplifiers of residual-stream signals rather than fact storage.