Intra-session Context-aware Feed Recommendation in Live Systems
This addresses session-level optimization for feed recommendation systems, which is incremental as it builds on existing methods by explicitly modeling user browsing decisions.
The paper tackles the problem of exposure bias in feed recommendation systems by modeling intra-session context to maximize total views and clicks, resulting in improved key business benchmarks upon deployment.
Feed recommendation allows users to constantly browse items until feel uninterested and leave the session, which differs from traditional recommendation scenarios. Within a session, user's decision to continue browsing or not substantially affects occurrences of later clicks. However, such type of exposure bias is generally ignored or not explicitly modeled in most feed recommendation studies. In this paper, we model this effect as part of intra-session context, and propose a novel intra-session Context-aware Feed Recommendation (INSCAFER) framework to maximize the total views and total clicks simultaneously. User click and browsing decisions are jointly learned by a multi-task setting, and the intra-session context is encoded by the session-wise exposed item sequence. We deploy our model online with all key business benchmarks improved. Our method sheds some lights on feed recommendation studies which aim to optimize session-level click and view metrics.