Unverified50% confidenceFactExact time
The Sigmoid function is defined as σ(z) = 1 / (1 + e^{-z}), and its derivative has the concise form σ'(z) = σ(z)(1 - σ(z)).
1
Sources
50%
Confidence
Long-term
Relevance
10/19/2026
First Seen
Sources
Building a Neural Network from Scratch with NumPy: A Hands-On Deep Dive into Backpropagation
redditr/deeplearning10/19/2026
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