Important: Recommendations AI has migrated to the Retail API, which is now generally available.
The Recommendations AI API (service endpoint https://recommendationengine.googleapis.com) and this documentation set remain available, but they will no longer be updated. We recommend migrating your recommendations to the Retail API (service endpoint https://retail.googleapis.com). See the new documentation:
Recommendations AI enables you to build an end-to-end personalized
recommendation system based on state-of-the-art deep learning ML models,
without a need for expertise in ML or recommendation systems.