AI and LLM strategies and application at Mercari Search

“Mercari is a Japan-based second-hand e-commerce marketplace. We have been relying on Elastic Search for retrieval and DNN Learning to Rank for ranking for a long time. With the development of deep learning and LLM, In this talk, I would like to share we re-architecture our search system and convince internal stakeholders to take on new technology. In addition, how some of those new technologies work and not work in C2Ce-commerce setting.

1. End-to-end search architecture walkthrough and what new components are working for us
2. Success LLM application: offline dataset labeling, query expansions, and language translation using LLM and image embedding
3. Business consideration of the new technology such as ROI analysis”

Kaiyi Liu

Mercari