返回到 Mathematics for Machine Learning: PCA

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1,282 個評分

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273 條評論

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....

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.

May 01, 2018

This course was definitely a bit more complex, not so much in assignments but in the core concepts handled, than the others in the specialisation. Overall, it was fun to do this course!

篩選依據：

創建者 Mohamed B

•Oct 27, 2019

I learned a lot in this course, though the last week was somehow hurried and the lecturer didn't spend enough time to piece the whole stuff together.

創建者 Jordan V

•Aug 23, 2019

Course addresses important subject, but I worth like to have more in-depth explanation of the mathematics by the instructors and more examples.

創建者 Kevin G

•Jan 14, 2020

Felt like explanations in this course were a bit confusing, but otherwise, it was a very interesting course. Thank you so much for doing this.

創建者 Giri G

•Jun 07, 2019

This was a very hard course for me. But I think the instructor has done the best possible he can with presenting and explaining the course

創建者 Jiaqi W

•Aug 13, 2018

Coding assignment is hard for people who are not familiar with numpy. Would appreciate some material at least going over the basis.

創建者 Voravich C

•Oct 21, 2019

The course level is very difficult and I think having four week course is not enough to understand the math behind PCA

創建者 Nguyen D P

•Oct 17, 2018

That's a great online courses can help people have enough background to break into Machine Learning or Data science

創建者 Ananthesh J S

•Jun 16, 2018

The PCA derivation part requires more elaborate explanation so that we can understand the concept more intuitively.

創建者 Manuel I

•Jul 07, 2018

Overall the hardest of the specialization, a though one but great to make sense of all the maths learned so far.

創建者 Shraavan S

•Mar 04, 2019

Programming assignments are a little difficult. Background knowledge of Python is recommended for this course.

創建者 Andrew D

•Jun 02, 2019

Very difficult course, make sure to do the prereq courses first and understand everything from those courses.

創建者 Ibon U E

•Jan 07, 2020

The derivations of some concepts have been more vague compared to other courses in this specialization.

創建者 Berkay E

•Aug 09, 2019

-Some of the contents are not clear.

+It gets great intuition for new learners in machine learning.

創建者 sairavikanth t

•Apr 29, 2018

Lot of Math. Couldn't get proper intuition regarding PCA, was lost in understanding math equations

創建者 Jessica P

•Aug 06, 2019

I agree with the others. Course didn't merge well with the 1st two which were perfect!

創建者 kerryliu

•Jul 30, 2018

still have room for improvement since lots of stuffs can be discussed more in detail.

創建者 Ruan v S

•Oct 14, 2019

Harder than expected, the content is good and is well worth the struggle!

創建者 Xin W

•Sep 06, 2019

This course is full of mathematical derivation, so it is kind of boring.

創建者 Jiaxuan L

•Jul 15, 2019

Overall a good course. Very limited introduction to Python though.

創建者 Lafite

•Feb 04, 2019

编程练习的质量不够高，不管是编程练习本身的代码逻辑、注释、练习的质量还是在答疑区课程组的答疑都不能尽如人意，对于编程练习并不很满意

創建者 Clara M L

•May 01, 2018

Not as good as the other two courses but still very intuitive

創建者 Cesar A P C J

•Dec 23, 2018

Good content, just need to fix the assignments' platform.

創建者 Sharon P

•Sep 25, 2018

Mathematically challenging, but satisfying in the end.

創建者 paulo

•Feb 11, 2019

great material but explanation are a little bit messy

創建者 Kwak T h

•Jul 27, 2019

Good but slightly less deeper than the other two