Two-Tower, DCN v2, and Transformers: How Modern Retrieval and Ranking Fit Together

Tue, 12 May 2026 08:21:39 -0400

If you’ve spent any time around modern recommendation, search, or ads systems, you’ve run into three architectures that keep showing up: two-tower models, DCN v2, and Transformers. They’re often discussed as if they’re alternatives, but in production they’re almost always composed. Each one solves a different problem, and the interesting design work is in how you fit them together.

This post walks through what each does, where they slot in, and how a typical large-scale retrieval-and-ranking stack actually uses all three.

DCN V2 on Yiwei Shi

Two-Tower, DCN v2, and Transformers: How Modern Retrieval and Ranking Fit Together