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
