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Obsidian Vault/inbox/But what is a neural network.md---
title: "But what is a neural network - Deep learning chapter 1"
authorName: "3Blue1Brown"
authorUrl: "https://www.youtube.com/@3blue1brown"
canonical: "https://www.youtube.com/watch?v=aircAruvnKk"
datePublished: "2017-10-05"
duration: "PT19M13S"
---
## Layer Structure and Activations
A neural network models handwritten digit recognition by mapping a 28x28 grid of pixel intensities onto 784 input neurons...