Pinterest Home feed 多目标优化的演进

Homefeed: Jiacong He, Dafang He, Jie Cheng (former), Andreanne Lemay, Mostafa Keikha, Rahul Goutam, Dhruvil Deven Badani, Dylan Wang
Content Quality: Jianing Sun, Qinglong Zeng

Homefeed: Jiacong He, Dafang He, Jie Cheng (former), Andreanne Lemay, Mostafa Keikha, Rahul Goutam, Dhruvil Deven Badani, Dylan Wang
内容质量: Jianing Sun, Qinglong Zeng

Introduction

引言

In feed recommendation, we recommend a list of items for the user to consume. It’s typically handled separately from the ranking model where we give probability predictions of user-item pairs.

在 feed 推荐中，我们为用户推荐一个物品列表供其消费。通常，这与排序模型是分开处理的，在排序模型中我们给出用户-物品对的概率预测。

Pinterest’s feed recommendation follows a cascaded system design with retrieval [1][2], pre-ranking [3], ranking [4][5], and re-ranking. While most of these prior works focus on optimizing immediate actions for each candidate Pin, this work will primarily focus on how we build the final layer of the recommendation funnel for multi-objective optimization. This is a critical part of our recommendation system as it helps us balance short-term and long-term engagement, drive new use case adoption, and satisfy various business requirements. Throughout the years, we have made substantial improvements on this layer through both algorithmic and infrastructure upgrades. In this tech blog post, we will share our experiences, learnings and improvements we’ve made over the years on this critical layer.

Pinterest 的 feed 推荐遵循一个级联系统设计，包括 retrieval [1][2]、pre-ranking [3]、ranking [4][5] 和 re-ranking。虽然这些先前工作大多专注于为每个候选 Pin 优化即时行为，但本文将主要关注我们如何构建推荐漏斗的最终层，用于多目标优化。这是我们推荐系统中的关键部分，因为它帮助我们平衡短期和长期参与度，推动新用例采用，并满足各种业务需求。多年来，我们通过算法和基础设施升级对这一层进行了实质性改进。在这篇技术博客文章中，我们将分享我们在这一关键层上多年的经验、学习和改进。

Overall System Design

整体系统设计

Figure 1. Cascaded Design of Pinterest Funnel.

Figure 1. Cascaded Design of Pinterest Funnel.

Figure 1 illustrates the cascaded funnel design of our feed recommendation system from retrieval to ranking to the multi-objective optimization component. While earlier stages mostly optimize for certain positive actions (e.g., sav...