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This paper introduces OneModel, a unified framework designed to optimize multi-scenario ranking in platform-scale recommender systems by integrating various user behaviors into shared event sequences. The approach employs an action-oriented backbone and Scenario-aware Information Modulation to effectively balance cross-stream transfer with stream-specific specialization, enhancing user representation and reducing engineering costs. In production at Xiaohongshu, OneModel achieved significant improvements in user engagement and advertising metrics, demonstrating its effectiveness over traditional separate ranking systems.
OneModel boosts user engagement by over 1% while simplifying the engineering complexity of multi-scenario ranking systems.
Platform-scale recommender systems often span multiple business streams such as organic recommendation, advertising, and merchant services, where user behaviors form a continuous cross-stream trajectory. Maintaining separate ranking systems fragments user representations and increases engineering cost. We propose \textbf{OneModel}, a unified framework for multi-stream final ranking. OneModel maps heterogeneous behaviors into shared event sequences, learns long-context user representations with an action-oriented backbone, and introduces \emph{Scenario-aware Information Modulation} to balance cross-stream transfer and stream-specific specialization. For production deployment, OneModel further adopts stratified user representation, multi-objective training, and optimized online serving with feature decomposition, user feature prefetching, shared user-tower computation, and graph-level inference optimization. We deploy OneModel in production at \emph{Xiaohongshu}, where it delivers consistent offline gains over strong baselines and scales favorably with context length and model capacity. Online A/B tests improve Time Spent by \textbf{+0.33\%} and Engagement by \textbf{+1.25\%} in Explore Feed, lift advertising value by \textbf{+3.43\%} and CTR by \textbf{+8.18\%} in Feed Advertising, and raise DGMV by \textbf{+1.1867\%} and GPM by \textbf{+2.1585\%} in Merchant Recommendation, validating unified multi-stream ranking as an effective production foundation.
