SPIN Unprocessed October 23, 2026 ai_technology research
Prediction Is Not Calibration: Item Parameter Recovery and Representation Coupling in Knowledge Tracing
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arXiv:2610.30211v1 Announce Type: new Abstract: Knowledge tracing (KT) models can estimate item parameters through an item response decoder trained solely for next-response prediction, yet predictive accuracy does not guarantee parameter recovery. We study 2PL, GPCM, and NRM decoders paired with LSTM, Transformer, and DKVMN encoders. Response-model derivatives show why discrimination and option slope updates depend directly on the scale and spread of estimated ability. Affine logit identities sh
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