Ganesh Epili
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Transformers From Scratch, Part 1: Why Attention Exists
July 25, 2026
·
22 min read
SERIES
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Transformers From Scratch
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Part 1 of 6
Part 2›
Attention Is the Whole Game
Transformers From Scratch — all 6 parts
01
Why Attention Exists
You are here
02
Attention Is the Whole Game
03
The 2017 Architecture, Assembled
04
The Family Tree (BERT, GPT & T5)
05
What Changed Since 2017
06
From Architecture to ChatGPT