ML Applications

Embedding-based Retrieval in Facebook Search

August 22, 2020

Abstract

Search in social networks such as Facebook poses different challenges than in classical web search: besides the query text, it is important to take into account the searcher’s context to provide relevant results. Their social graph is an integral part of this context and is a unique aspect of Facebook search. While embedding-based retrieval (EBR) has been applied in web search engines for years, Facebook search was still mainly based on a Boolean matching model. In this paper, we discuss the techniques for applying EBR to a Facebook Search system. We introduce the unified embedding framework developed to model semantic embeddings for personalized search, and the system to serve embedding-based retrieval in a typical search system based on an inverted index. We discuss various tricks and experiences on end-to-end optimization of the whole system, including ANN parameter tuning and full-stack optimization. Finally, we present our progress on two selected advanced topics about modeling. We evaluated EBR on verticals for Facebook Search with significant metrics gains observed in online A/B experiments. We believe this paper will provide useful insights and experiences to help people on developing embedding-based retrieval systems in search engines.

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AUTHORS

Written by

Jui-Ting Huang

Ashish Sharma

Shuying Sun

Li Xia

David Zhang

Philip Pronin

Janani Padmanabhan

Giuseppe Ottaviano

Linjun Yang

Publisher

Knowledge Discovery and Data Mining (KDD)

Research Topics

Human & Machine Intelligence

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