Functions and graphs

A function takes an input and gives back exactly one output: f(x) = 2x + 1 turns 3 into 7. Its graph plots every input against its output, so you can see where it rises, falls or levels off. A whole neural network is one big function: text or pixels in, a prediction out.

Why it matters: Neurons, losses and models are all functions, so reading one is the first skill.

Learn it, then prove it

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