📚 node [[sigmoid_function|sigmoid function]]
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📓 garden/KGBicheno/Artificial Intelligence/Introduction to AI/Week 3 - Introduction/Definitions/Sigmoid_Function.md by @KGBicheno

sigmoid function

Go back to the [[AI Glossary]]

A function that maps logistic or multinomial regression output (log odds) to probabilities, returning a value between 0 and 1. The sigmoid function has the following formula:

Sigmoid function

where $\sigma$ in logistic regression problems is simply:

sigma in a logistica regression is

In other words, the sigmoid function converts

into a probability between 0 and 1.

In some neural networks, the sigmoid function acts as the activation function.
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