Ozon

From ANN to Exact KNN on GPU: How We Rebuilt Candidate Selection for Ozon Recommendations

Ozon's recommendation team replaced approximate nearest neighbor (ANN) search with exact K-nearest neighbors (KNN) on GPUs, embedding business logic directly into the computation to improve recall and flexibility. The new pipeline processes tens of millions of users and hundreds of millions of products daily, enabling real-time filtering and diversity control without costly post-processing.

Ozon