Some people complained about this course or specialization such that there was not enough help or the instructors were so lazy that a lot of the time, they just rushed through and ignored the details. But I LIKE this course and this specialization. All those complaints expressed by some people worked to my advantages. I do not need someone to monitor me at every step, so I do not mind the instructors stay out of discussion forum most of the time. Indeed, the most recent reply from an instructor I saw was a year old (or 2-year old, don't remember exactly). I would have genuinely hated this course or specialization if the instructors intervened at every step.

Throughout this specialization, I was able to discuss course contents and algorithm codes freely on the discussion forum. That really enhanced the learning experiences. I did not feel that my learning journey was micromanaged and I truly valued that freedom to develop my own understanding and insights.

I gave all three courses in the specialization a five-star review (would give six stars if that is available). I would definitely take another course by the instructors on Coursera.

PCA is derived using the mathematical approach. I liked this, it was systematically done by the lecturer without leaving me puzzled on how he did it. If you do not like maths, sums, the delta operator and so forth this might not be the right course for you.

However, the course is quite buggy and needs a mayor overhaul. Quizzes in the videos have no answers, the practial assignments have quite some bugs - outside the code, we are supposed to edit.

Fixes for these bugs can found in the forums or - given enough Python and NumPy knowledge - be fixed by one self. Yet the instructors do not fix these once and for all. To me this seems lazy and I expect more from a course that is paid for and has an audience that is mostly doing this during afterhours and wants to learn something about PCA and not on how to find workarounds to please the AutoGrader. Without these issues and I would have given the course a 5-star rating.

This course is remarkable for the rigour it takes you through to understand the PCA. If you make it through and understand everything it is well worth it.

Unfortunately, you will almost certainly need to supplement the course with materials, videos, and theory from elsewhere, because a great bulk of the lectures are not intuitive, you might as well be learning from a rather obtuse textbook.

The assignments as many have mentioned, continue to have bugs and errors, despite the recent attentiveness of the course staff on the forums.. hopefully they will be fixed soon. At least they've finally included a Numpy tutorial.

Overall though. I have to say, this course, if you stick with it, will force you to get a robust grasp of the linear algebra that you've been taught so far, and it is a good exercise. Although, it's certainly not a smooth ride.

I was frustrated at several points during the course - I had to scour the internet for material to improve my understanding which defeated the purpose of taking the course (math and intuition behind PCA for instance). I felt as if the instructor was reproducing material from textbook on the board. I would guess that the abandonment rate for this course is relatively high (in-spite of the introductory nature) because of monotonous delivery and lack of intuitive explanation of concepts (vs. Khan Academy/Andrew Ng for instance).

I am very disappointed with this course. It was very hard to follow, and not because this is challenging, but partly because the instructor is not so good. I had to read a lot on my own to be able to complete some assignments. I hope you can improve the content of this course. The best course of this specialization is the second one, and this is the worst.

Course is targeted more on pure math derivations, rather then real world applications. For my opinion, it doesn't fit well with other courses in this specialisation. it goes too Deep in math derivations. It should fit for students interested in mathematics and not engineers, who want to get more insights in ML related math.

The topic of this course is an important and extremely useful concept and approach for Machine Learning and other applications. However, the way it was taught was ineffective for learning (to me personally and I suspect to many others as well) regardless of our different backgrounds or lack of strong math skills.

Although the concept of PCA is rather simple, its computations and the interpretations & meanings of each transformation are challenging without examples and visualizations. We did have some examples in the course, but not detailed and complete enough to fully understand PCA intuitively and thoroughly.

One ended up spending huge amount of time reading additional relevant articles on internet, fishing out useful information from Discussion Forums, yet still struggling a great deal to write codes for completing assignments. Even though the codes run through without returning mistakes and one gets "pass", there is not much satisfaction and joy one feels in learning because sometimes, the initial learning from listening to the lectures was so insufficient and inadequate for doing the assignment that one simply completes the task doing all one can without further understanding and solidification of the knowledge.

This feeling is in such a huge contrast to those when learning the two other related courses in the Specialization (Linear Algebra and Multivariate Calculus) during which one enjoyed immensely the learning process as well as the content. Here I do not think that one can attribute the difference to the seemingly higher level of difficulty of PCA. The instructors for those two courses did an excellent job to explain things intuitively and thoroughly.

Marc is an extremely knowledgeable and competent professional. By changing the teaching style more in tune with the learners, I am sure more people will learn a great deal from this course and enjoy the learning process in the meantime. Thank you for the hard work put into teaching this course all the same.

p.s. If the teaching staff involved can fix all technical issues or mistakes related to the Assignments, it will greatly benefit the learners. Thank you.

I passed the course with good grades, I like an idea of such course. But my opinion is: the course needs substantial improvement. Period. I personally enjoyed listening to Marc Peter - he's an excellent lecturer and super-smart guy. His book on math for Machine Learning is challenging, but almost perfect. But the course itself is a disappointment. 1) Precious lecturer's time is _wasted_ on explaining very basic concepts such as mean and variance... to make the course accessible for poor gals/guys with no math in head at all and, consequently, to enable Coursera to earn more $$. But it doesn't help - what they'll do in Week 4 once eigenvectors with show up from nowhere?? Unfortunately the course is not for them

2) Lecturer wastes his _super precious_ time by multiplying matrices by hand. Screw it. I'm also lecturer at university and from my experience such demo should be done once/twice. And after that, guys, matrix operations in numpy have to be demonstrated in the class, otherwise practical exercises could be done only by those with solid prior experience in Python + NumPy

3) Quality of practical assignments is below any critics. Some cannot work at Coursera platform, they should be run locally and to run Jupiter Notebook locally one has to be seasoned Python programmer and good DevOps. Guidelines to practical assignments do not guide at all. SW practices in assignments are dubious.

Bottom line: kindly advice to develop two courses - overview for those without linear algebra knowledge at all, and normal one - focused on Week 4 material. Coursera format with 5 minute lectures cannot accommodate such course? Leave this platform, Marc Peter is great lecturer and specialist, his name should not be associated with such failure.

Regards,

Akiva

I have already completed this course but i felt like i needed to share my frustration regarding this 3rd course of the specialization. First of all, the previous two courses were excellent! I am not judging based on difficulty, those two courses opened my eyes on linear algebra and calculus. But this 'PCA' one is utterly disappointing. It revisited some theories of the previous courses in such a bad way.

If most of the things need to be learnt through the reading materials then is it justified to do this course? I mean I can find even better reading materials on the web. The only reason i kept on going is to go through the PCA portion of week 4. All topics of previous weeks were already covered by me that's why i didn't have to struggle much. But the explanations were quite inadequate and proofs of the theorems felt like rushed. I somehow managed to reach the final assignment and then my real frustration began. The grader was giving inappropriate results, submitting my code gave me 2/3 out of 10. after resubmitting with the same code multiple times, I finally passed the assignment. Won't recommend this course to anyone.

The lecturer doesn't provide us with adequate information to connect all materials together. Much knowledge in lectures are not enough or unrelated to completing programming homework or tests. In one of the programming assignment, the guidance is misleading and I believe most of us reached out for help in forum to finish the assignment.

In week one, everything looks pretty simple but the question and lectures are kind of unclear. Everything then goes worse in week two. the programming assignment is a nightmare. If you are familiar with python, you may only spend hours to complete this. Otherwiese you may have to struggle between unclear guidance, bugs and python syntax. Week three is not so bad but a lot of resource are from wikipedia with little illustration. Week four is jammed with auxiliary materials and massive critical PCA knowledge with limited explanation. I simply feel I was fooled to enroll in this course.

After taking/passing the two previous courses, this course is very disappointing. The programming assignments are more about numpy/python peculiarities (which dimension is D or N) and deciphering cryptographic specifications (X is documented as an input but not a parameter to the function). The misleading templates appear to be intentional - it is not clear what educational purpose this serves. The difficulty in this course is not conceptual understanding - it is difficult because the assignments are intentionally confusing. Another point regarding programming in general. This course prefers implementing numerous functions (no testing), generating large amounts of random data as input, and assuming all goes well. Perhaps each function should be tested for correctness individually with known input/output - this is not a novel idea.

This was a terrible course in every way possible. DO NOT waste your time and money on it. The lecturer skips over things way too fast and delivers poor explanations, and then gives ridiculously hard programming assignments when this course is supposed to be mainly about maths. Moreover, he asks quiz questions about topics he doesn't even cover in the lectures, and the answers provided are terrible. Very poor quality course, which is a shame, because the other two courses in this specialization are actually worth doing.

I've finished all the two previous courses in this specialization.I was shocked at seeing the content and programming assignments given to us.It was totally different.They expect a lot from us.Content is not up to the mark.First two courses was awesome.But this course is an exact opposite to the first two.Totally disappointed!! I was hoping to finish this specialization.But it seems I cannot. I didn't expect this.

The course is mathematics for Machine Learning. Yet, they require that you are proficient in python. I understand the mathematics. However, no one will answer my questions on the python we are suppose to code. I passed both of the previous courses. I've taken and passed Statistics with python on edX. I've very disappointed in this course.

Instructor writes down equations and formal definitions while reading out loud what he is writing. None further explanations are given.

Basically whole course is a voiced list of equations together with some links to Wikipedia which even further empathize pathetic quality of content.

Marc Peter Deisenroth jumps too much at the important computation steps. Some steps might be simple to him, but it could be very misleading to students.

Often times, he will just throw out some equations without letting the student know what exactly we are trying to achieve.

Intentionally obtuse. No effort whatsoever is given to helping people learn. The instructors don't answer questions and they admittedly make their lectures hard to understand.

I only took this because there were no other courses on available at the time.

The lectures are only partly related to the quizzes and assignments, some parts are just unnecessarily over complicated and confusing. The final and most important assignment is so computationally heavy so it's hardly running locally

Programming assignments' quality is too bad to follow it. Their lecture's explanation and assignments' notation are not matched. Moreover, the code is sometimes ridiculous.

The didactic value of this course is rather low. The lectures do not explain the very concepts required to sovle the subsequent assigments, or do it in a very poor way.

Now i feel confident about pursuing machine learning courses in the future as I have learned most of the mathematics which will be helpful in building the base for machine learning, data science.

This course covers critical material, but unfortunately does not present them well. I found myself having to constantly find outside resources for clearer explanations. For many topics, the course itself makes no attempt to explain them, but just presents links to dense reading material and, in a couple of cases, Wikipedia articles. In my opinion, if you're linking to Wikipedia for core components of the course, you're no longer justified charging for that course. The lectures are spent deriving formulas, but providing little or no intuition about what they mean or how they are used. The course does not prepare one well for the final lab in particular, which felt like a disconnect from the lectures, had unclear explanations of what to do, and contained errors in the provided code. I did power through it, and I did learn something about PCA, but feel like I needed there to be something more to cement what I learned in practical understanding.

The content of this course is very good. However, all of my programming assignment (or lab excercises) can not be delivered/graded due to the bugs. Some guys mentioned the same issues in Discussion Forum, however, the solution does not work for me. I am pretty sure all the tests passed, but my grades are always zeros. Meanwhile some of the answers of the assignments are not current. I mentioned all of these above by email to coursera, and not responses. In conclusion, if you only want to learn something without a certificate, it is okay. PCA is a powerful tool in the reality.

After the first two courses in the specialisation, this one was truly disappointing. You are warned at the beginning that this course is challenging. This is true, but there is absolutely no reason why it should be THIS challenging. There are several factors that make this course more difficult than it needs to be. The poor pacing leads to a bizarre mix of repetitive trivial questions and vague assignments with poor explanation and over-reliance on reading external sources. Nobody wants constant hand-holding but the lack of direction will lead to you wasting far too much time chasing down minor technical errors and figuring out what on earth is being asked of you. Finishing this course was a slog and I just wanted to wash my hands of it. The first two courses in this specialisation are great and I highly recommend them, but I would not be happy if I had paid £38 for this course.

I did the 3 specialization lessons "Mathematics for Machine Learning" (Linear Algebra, Multivariate Calculus, PCA). I really had a lot of fun and learnings in the first one (5 stars for Linear Algebra): David Dye is an increadible teacher. The second one is okay (3 stars for me). In the third one (PCA) the expected knowledge difference between the lessons (easy to follow) and the programming tasks of weeks 2 and 4 was to high and to much challenging for me. I had no fun to pass the corresponding tests and I have finished the lessons with the only one target to be done. It doesn't correspond to what I'm looking for when I'm learning during my week-end.