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1import numpy as np23# A neuron is a voter. Three inputs, three weights, one bias.4inputs = np.array([0.7, 0.2, 0.9])5weights = np.array([0.4, -0.3, 0.6])6bias = 0.178z = np.dot(inputs, weights) + bias9out = 1 / (1 + np.exp(-z)) # sigmoid: 'fire?'10print(round(out, 3)) # -> 0.659
Illustrated step
The neuron isn't a brain cell. It's a voter.
Three signals walk in. Each has a weight - how loud that voice gets. The neuron sums them, adds bias (its own opinion), and decides whether to fire. That's it. That's the whole story.



