Notes + Interactive Backprop Reference

Course Q&A Deep Learning Specialization Neural Networks and Deep Learning
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I put together my notes for Weeks 2–4 — logistic regression as a neural network, shallow nets, and building an L-layer network from scratch. Writing these up as I went really helped things click, especially backprop.

Sharing two resources:
:memo: Full notes → [https://lnkd.in/ghe_bUBS]
:high_voltage: Interactive backprop reference (every formula, every dimension) → [https://lnkd.in/gZZVSuNW]

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Adding @Community-Team

@Yanqi_Huang
Congrats on the writeup.
Please remove the python code snippets from your text that match exercise problems within the course notebook.