arXiv AI By Renzhi Wu, Zikun Cui, Junjie Yang, Li Sheng, Yongjun Xie, Jerry Fu, Nipun Mathur, Sri Reddy, Hong Li

PRISM: Personalized Item Representations in User History

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PRISM introduces personalized item representations in user history, allowing each item’s embedding to reflect its relationship to a specific user rather than using a shared embedding across all users. The method leverages upstream ranking computations and an autoencoder to compress user and item tower states into a single embedding per scored pair for downstream replay. Offline tests on a billion‑scale recommendation surface show a modest but measurable improvement in downstream normalized entropy, with gains scaling with sequence length according to a power‑law relationship.

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