Python implements linear regression (a) principle

Linear regression is the basis of machine learning and is very useful in daily work.

1. What is linear regression

One-dimensional linear regression can be accomplished by finding the curve of the function with multiple points.

2. Mathematical representation

is the Intercept value, which is the offset.

Because it takes a lot of space to simply calculate a polynomial, it is necessary to transform the equation into a matrix product form.

3. Least Squares model

First define a function L to represent the loss functions (computed by existing x, y data)

4. Gradient Descent

Disadvantages of direct computing: insufficient computational performance.

So choose the gradient descent method.

Python implements linear regression (a) principle