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Attention in transformers, step-by-step | Deep Learning Chapter 6

3Blue1Brown · explainer · Watch on YouTube

LLMs & generative AIMachine learning & deep learning

What it is

3Blue1Brown's visual walkthrough of the attention mechanism inside transformers, covering self-attention, multiple heads and cross-attention. It is chapter 6 of his deep learning series.

Why Hacker News recommends it

HN treats it as the go-to visual explanation of attention, recommended to people who find text-based transformer explainers hard to follow.

  • 5 people recommended it
  • 4 different months
  • 2 strong recommendations
  • first 2024, last 2026

What HN commenters said

  1. “what bade me finally understand the transformer architecture [0] and attention [1], are 3Blue1Brown's videos.”

    Made the commenter finally understand transformers and attention.

    tomashm, 2024-07 · Strong recommendation · in “The Illustrated Transformer (2018)”

  2. “If you aren't familiar with hyper words, this is an amazing series”

    Amazing series on how tokens become vectors and mutate through attention.

    onlyrealcuzzo, 2026-05 · Strong recommendation · in “Claude Opus 4.8”

  3. “Attention in transformers, visually explained | Chapter 6, Deep Learning”

    Visual explanation of attention in a list of better resources.

    MAXPOOL, 2024-07 · Recommendation · in “The Engineer’s Guide to Deep Learning: Understanding the Transformer Model”

  4. “I suggest checking out 3blue1brown's videos on gradient descent”

    Shows how attention actually works, versus voting metaphor.

    superkuh, 2024-10 · Recommendation · in “LLMs Aren't Thinking, They're Just Counting Votes”

  5. “For something gentler, 3Blue1Brown”

    Gentler introduction to attention, part of a series.

    wren6991, 2026-06 · Recommendation · in “Can I Buy Your KV Cache?”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: attention, transformers, llm, deep learning, visualization, 3blue1brown

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