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Deep Learning Academy · Lesson

Dot Products Power Every Layer

How a weighted sum becomes a neuron's output.

The Humble Dot Product

Strip a neural network down and you find one move repeated: the dot product, a sum of paired multiplications between two vectors.

Multiply, Then Add

A dot product multiplies each input by its matching weight, then adds the results into a single number. That number is the neuron speaking.

score = (x * w).sum()  # or x @ w

All lessons in this course

  1. Why Loops Are Slow for Math
  2. Elementwise Ops & Reductions
  3. Matrix Multiply with matmul and @
  4. Dot Products Power Every Layer
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