Neural Networks（1）Logistic regression

17/10/29 MWhite's learning notes

Binary Classification

Logistic regression is a kind of binary classification. In binary classification, the answer y is equal to 0 or 1.

Sigmoid function

Loss (error) function

For a scalar parameter θ, a decision function whose output is an estimate of θ, and a quadratic loss function.

Cost function

The average of loss function