Author(s): DrSwarnenduAI

Originally published on Towards AI.

For a decade, we asked if RNNs can represent what Transformers represent. We proved they can. We forgot to ask how expensively. That omission just cost us ten years.

“Can our architecture represent everything a Transformer can?” The benchmarks run. The perplexity scores appear. The answer, roughly, is yes.

The article discusses the limitations of recurrent neural networks (RNNs) compared to transformers, particularly regarding their ability to represent complex structures succinctly. It reveals that while RNNs can compute functions similar to transformers, they require exponentially more parameters, especially in tasks requiring deep compositional structures. The piece highlights that evaluations of model efficiency often overlook the underlying parameter costs, which become apparent at higher nesting depths in tasks. Ultimately, it advocates for hybrid architectures that leverage the strengths of both RNNs and transformers to optimize performance in various computational contexts.

Read the full blog for free on Medium.

Published via Towards AI

Towards AI Academy

We Build Enterprise-Grade AI. We'll Teach You to Master It Too.

15 engineers. 100,000+ students. Towards AI Academy teaches what actually survives production.

Start free — no commitment:

→ 6-Day Agentic AI Engineering Email Guide — one practical lesson per day

→ Agents Architecture Cheatsheet — 3 years of architecture decisions in 6 pages

Our courses:

→ AI Engineering Certification — 90+ lessons from project selection to deployed product. The most comprehensive practical LLM course out there.

→ Agent Engineering Course — Hands on with production agent architectures, memory, routing, and eval frameworks — built from real enterprise engagements.

→ AI for Work — Understand, evaluate, and apply AI for complex work tasks.

Note: Article content contains the views of the contributing authors and not Towards AI.

---