# 学生对 伦敦帝国学院 提供的 Mathematics for Machine Learning: PCA 的评价和反馈

4.0
1,915 个评分
457 条评论

## 课程概述

This intermediate-level course introduces the mathematical foundations to derive Principal Component Analysis (PCA), a fundamental dimensionality reduction technique. We'll cover some basic statistics of data sets, such as mean values and variances, we'll compute distances and angles between vectors using inner products and derive orthogonal projections of data onto lower-dimensional subspaces. Using all these tools, we'll then derive PCA as a method that minimizes the average squared reconstruction error between data points and their reconstruction. At the end of this course, you'll be familiar with important mathematical concepts and you can implement PCA all by yourself. If you’re struggling, you'll find a set of jupyter notebooks that will allow you to explore properties of the techniques and walk you through what you need to do to get on track. If you are already an expert, this course may refresh some of your knowledge. The lectures, examples and exercises require: 1. Some ability of abstract thinking 2. Good background in linear algebra (e.g., matrix and vector algebra, linear independence, basis) 3. Basic background in multivariate calculus (e.g., partial derivatives, basic optimization) 4. Basic knowledge in python programming and numpy Disclaimer: This course is substantially more abstract and requires more programming than the other two courses of the specialization. However, this type of abstract thinking, algebraic manipulation and programming is necessary if you want to understand and develop machine learning algorithms....

## 热门审阅

##### JS

Jul 17, 2018

This is one hell of an inspiring course that demystified the difficult concepts and math behind PCA. Excellent instructors in imparting the these knowledge with easy-to-understand illustrations.

##### NS

Jun 19, 2020

Relatively tougher than previous two courses in the specialization. I'd suggest giving more time and being patient in pursuit of completing this course and understanding the concepts involved.

## 176 - Mathematics for Machine Learning: PCA 的 200 个评论（共 455 个）

Jan 25, 2019

This was a tough course. But worth it.

May 24, 2020

Thank you for offering a nice course.

Jul 22, 2018

very challenging and rewarding course

May 13, 2019

May 18, 2020

Very Good Course to Learn about PCA

Jun 11, 2018

What you need to understand PCA!!!

Jun 05, 2020

Great course very recommended

Jun 16, 2019

excellent course by imperial

May 15, 2020

Tough course, learnt a lot.

Dec 20, 2018

Great Coverage of the Topic

Apr 09, 2019

Great course for every one

Dec 25, 2019

Challenging but Excellent

Jul 17, 2020

Excellent course content

Jul 02, 2020

This course is very good

May 26, 2020

Thank you very match

Mar 03, 2020

hard but good course

Sep 15, 2019

I had big fun of PCA

Jun 20, 2020

I enjoyed learning.

Jul 15, 2020

Cruel pero justo!!

Apr 15, 2020

Amazing Course!!!!

Feb 17, 2020

Great instructor!

Jul 21, 2019

Tough, but great!

Jul 25, 2018

AWESOME!!!!!!!!!!

May 23, 2018

Truly exceptional

Sep 24, 2019

Very Good Course