collaborators

9 papers

cs.IR2026

PinRec: Unified Generative Retrieval for Pinterest Recommender Systems

Edoardo Botta, Jaewon Yang, Yi-Ping Hsu +6

Generative retrieval methods employ sequential modeling techniques, like transformers, to generate candidate items for recommender systems. These methods have demonstrated promisin…

cs.IR2026

UniPinRec: Unifying Generative Retrieval and Ranking at Pinterest Scale

Hanyu Li, Yi-Ping Hsu, Aditya Mantha +17

Modern recommendation systems predominantly train retrieval and ranking as separate models despite both increasingly relying on large transformers encoding the same user behavior d…

cs.IR2026

LLMs Need Encoders for Semantic IDs Too

Xiangyi Chen, Zelun Wang, Xinyi Li +3

Multimodal LLMs use dedicated encoders to bridge non-language modalities (vision encoders for images, depth models for audio codec tokens) because raw token embeddings alone cannot…

cs.IR2026

A Production-Ready RL Framework for Personalized Utility Tuning with Pareto Sweeping in Pinterest Recommender Systems

Yichu Zhou, Mehdi Ben Ayed, Lin Yang +9

Large-scale recommenders encode multi-objective trade-offs by combining multiple predicted outcomes into a single utility score. Although this utility layer can be updated independ…

cs.LG2025

PinFM: Foundation Model for User Activity Sequences at a Billion-scale Visual Discovery Platform

Xiangyi Chen, Kousik Rajesh, Matthew Lawhon +9

User activity sequences have emerged as one of the most important signals in recommender systems. We present a foundational model, PinFM, for understanding user activity sequences…

cs.IR2025

OmniSage: Large Scale, Multi-Entity Heterogeneous Graph Representation Learning

Anirudhan Badrinath, Alex Yang, Kousik Rajesh +5

Representation learning, a task of learning latent vectors to represent entities, is a key task in improving search and recommender systems in web applications. Various representat…