ljmatilda

Ctrl-s : saves the current file Ctrl-z : undo Ctrl-y : redo Ctrl-[ : indent a line or a group of lin

准备夯实一下自己的计算机技术基础，跟着John Denero 学习 Structure and Interpretation of Computer Programs，可惜用的是python，python就python吧，我也可以趁机捡一下python。 第一个video没什么…

In particular, linear regression is a useful tool for predicting a quantitative response, it serves as a good jumping-off point for newer a…

In essence, statistical learning refers to a set of approaches for estimating f. There are two main reasons that we may wish to estimate f:…

Statistical learning refers to a vast set of tools for understanding data. These tools can be classified as supervised or unsupervised. Bro…

Gradient descent gives one way of minimizing J. Let’s discuss a second way of doing so, this time performing the minimization explicitly an…

Linear regression with multiple variables is also known as "multivariate linear regression". We now introduce notation for equations where …

The inverse of a matrix A is denoted A-1. Multiplying by the inverse results in the identity matrix. A non square matrix does not have an i…

. Matrices are not commutative: A∗B != B∗A . Matrices are associative: (A∗B)∗C = A∗(B∗C)(A∗B)∗C=A∗(B∗C) The identity matrix, when multiplie…