Building a multi-stage recommendation system (part 2.1)

Heavy ranking model strategy and design — Multi-gate Mixture-of-Experts

In the first post of this series, we learned about the importance of adopting a multi-stage recommendation strategy, especially for companies with large item catalogs. We learned what candidate generation was and implemented one of its famous representatives: the two-tower model. In this post, we move on to the next step in the pipeline which is the ranker. Its job is, given a few hundred candidates issued by the generator(s), to order them properly (rank them) so…