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學生對 提供的 Convolutional Neural Networks 的評價和反饋

40,516 個評分
5,372 條評論


In the fourth course of the Deep Learning Specialization, you will understand how computer vision has evolved and become familiar with its exciting applications such as autonomous driving, face recognition, reading radiology images, and more. By the end, you will be able to build a convolutional neural network, including recent variations such as residual networks; apply convolutional networks to visual detection and recognition tasks; and use neural style transfer to generate art and apply these algorithms to a variety of image, video, and other 2D or 3D data. The Deep Learning Specialization is our foundational program that will help you understand the capabilities, challenges, and consequences of deep learning and prepare you to participate in the development of leading-edge AI technology. It provides a pathway for you to gain the knowledge and skills to apply machine learning to your work, level up your technical career, and take the definitive step in the world of AI....




Great course. Easy to understand and with very synthetized information on the most relevant topics, even though some videos repeat information due to wrong edition, everything is still understandable.



Great Course Overall\n\nOne thing is that some videos are not edited properly so Andrew repeats the same thing, again and again, other than that great and simple explanation of such complicated tasks.


5026 - Convolutional Neural Networks 的 5050 個評論(共 5,347 個)

創建者 Arijit G


Andrew is like my inspiration. The entire specialization is top notch, but somewhere or the other this course is quite off par. After going through the videos several times also things are still a mess.

I love how Andrew makes things easier but this needed more delicate tuning with a bit of programming included in the videos. How to go ahead with transfer learning, how to move on building our own ConvNets.

The course started superbly with the description of filters. How horizontal and vertical filters are made and everything but with the algorithms it went puff. A more delicate approach to teaching the complex models would have helped.

And this course really needed a fully-fledged assignment and not fill in the blanks type. Hopefully, the instructor takes note of this.

創建者 Nathan Z


Course content is very presented very clear in classic Andrew Ng fashion. However I found the assignments to be lacking - for instance, in the object detection assignment featuring the YOLO algorithm, you don't actually build the algorithm, despite spending time in the course learning about the inner workings of the algorithm. However, to be fair, after taking this course you probably have the know-how to implement yolo yourself... still, I wasn't as happy with the assignments as I was in previous courses in this series. Oh well. However the first couple of weeks contain proper assignments that have you building convolutional neural networks from scratch. Also the updated 2022 version has new models like mobile-net, which I thought was pretty cool.

創建者 Christian C


Generally, I admired the "fundamental principles" approach in which the course was taught. It's helpful for those who want to understand CNNs from scratch.

On the other hand, there are some points for improvement. First, I think the programming exercises are insufficient: they are good for an entry-level experience of how the lectures are implemented, but I think they need some additional exercises (probably optional) that will focus more on practical settings. Second, I think it's time for the course to consider adapting to TensorFlow 2.x.x. Third, although this is rather too personal, I found the discussion on object detection too short.

Nevertheless, I would recommend this course to anyone who just wants to gain conceptual understanding on CNNs.

創建者 Nathan W


Of the classes offered by this source, this has really been the weakest. The editing errors (and tone in the background) were mechanically really grating, but the bigger issue is that the classes try to introduce tensorflow and keras. One of the strengths of the earlier units was they kept to matlab or numpy, two very solid low level tools that both really require digging into the mechanics AND are very stable themselves. The TF/Keras stuff on the other hand introduces confusion, skips over mechanics rather than teaching them, and are already out of date. Even worse, because they are out of date, things like links to documentation often fail. So the class feels dated even though it could have stuck with tools that do not really age.

創建者 Ian P


The YOLO week was fuzzy on some fundamental concepts around what a ConvNet output looks like when split into a grid and how bounding boxes are resolved when the shape extends beyond it's own cell. You can see a lot of confused students asking similar questions on this in the forum and most of the TAs seemed pretty unsure of their understanding of YOLO as well and hedged most of their responses with "This is the way I understand it, but I may be wrong". The YOLO homework and the Neural Style Transfer homework had a poor introduction to some very unintuitive Tensorflow concepts. It's got my curious about how the Fast.AI course made the switch from Tensorflow to PyTorch - I'd love to make that switch after these assignments.

創建者 Jake B


I liked the content of the lectures but this course seems unfinished. Several of the videos were poorly edited and contained portions which were clearly meant to have been edited out. More disappointing, the assignments did not build on each other or the lectures very well and some of the assignments required more understanding of TF than was provided trough the earlier assignments. Also, it seems like the assignments did not follow clear patterns which made them somewhat difficult at times.

IMHO, the Neural-style transfer material can be removed and replaced with more exercises in TF or Keras. I think that that would be more valuable and help people be better prepared to use either on their own.

創建者 Trevor M


As with the rest of this course, great lectures, terrible coursework.

Not saying it's not understandable, because in order to offer this course to hundreds of thousands of people, they have to automate the process, which means you can't have people checking your work to grade you, so you cannot have complicated projects (which is somewhat ironic given this is a series on deep learning and artificial intelligence). It would be fantastic, if it was structured similar to the Machine Learning course by Andrew Ng. Anyhow, if you want to gain a better understanding on these topics, you have to go out and build your own networks from scratch, and read the papers.

創建者 Klas K


The subject of this course is very interesting and I love that it is so bleeding edge. But the quality needs to be improved. Many videos repeat the same sentence again and again and seem to be very poorly edited. But even more annoying (and time consuming!) are errors and inconsistencies in the excercises. Most Notably in the grader (triplet_loss for week 4). Also, the changes to the quiz result displays are not helpfull: I was told that my answer was wrong for at least 2 questions where I was pretty sure and I would have liked to see that the answer I intended to give really is the wrong one. Maybe I just clicked the wrong checkbox unintentionally.

創建者 Raj S


Course material is good but lacks in the area on how to use tensorflow. Unfortunately, tensorflow documentation itself is terrible. Testing and grading systems are buggy and haven't been fixed for months (check the forums). Specifically, for the first programming assignment when one of assignment functions returns correct answer based the specifications provided in the code the grader grades it 0 and grades it correct when you violate the specifications and generate a wrong answer. In the quiz, portions of the questions are blank/missing and one has to totally guess the answer (obviously I was unlucky to guess both my questions wrong :( )

創建者 Guenther M


Had problems with assignments in Week4 : the strange thing: sometimes everything is explained in maybe even to much detail, then again there are cases where one feels fooled like when you have to use np.sum() instead of tf.reduce_sum() in the verify()-cell. By suggesting the use of tf.reduce_sum in the cell before you indirectly suggest its usage also later on! And this really doesn't add anything to your qualification, it is just annoying having to skim a lot of threads in the forum to finally find out the solution.

And more care should have been given to the videos: Andrew's repetitions of whole sentences should have been cut out!

創建者 Nathan Y


While as always Professor Ng was brilliant and informative, the final homework assignment (face recognition) was a disaster. Not only could we not load the weights because of corrupt files, but when that was resolved and the homework was submitted, the grader would only pass students who intentionally answered the Triplet section of the code wrong. What made this especially painful was the time it took to run the models. Tensorflow is not the easiest code to debug. One of the mentors from the course needs to monitor the forums closely - twice a day would not be too often. React and take charge when things start going badly.

創建者 Abhishek R


The course material is really good and Andrew explains things really well. However, the programming assignments cause a lot of problem owing to the performance of the grader where by correct answers are marked as incorrect/incomplete and the only option to submit the assignment OR get it graded correctly is to follow steps from the forums to make changes to the files to trick the grader in order to get it submitted. From the forums it seems like these problems have been there for over 2 years and still has not been fixed. Overall the programming assignments are really good and helps in understanding the implementations.

創建者 Adi G


I was taking this course because I hope to apply machine learning to biological problems. So while the first two weeks were great and super general, the third and particularly the fourth weeks were less relevant to me at this point but I had to struggle with them to get the certificate. Ideally, I would say that a way to improve this would be to create another week, dedicated either to biological problems or to something more general to all and let the students choose between the content of that week vs. the current 4th week. Another option is to make this a 3-week course and leave the 4th week entirely optional.

創建者 Vincent S


The video lessons gives very clear and understandable concepts but I didn't feel that the coding exercises will help me to write my owns. I could easy fill in the blanks and get the required grades but I have to admit that for the most of it I didn't understand what I was doing or what was happening in the part I didn't have to fill in. I have a reasonably strong mathematical background and barely no coding knowledge (a bit of Matlab and beginner python training). The whole deeplearning program was going relatively well up to the coding exercises in this course which jump a step too much for me.

創建者 David


Not as great as the previous three courses. The exercises here are much more challenging than before, but not always for the right reasons. A thorough primer on Tensorflow should be made mandatory in this course. A lot of the time you eventually manage to complete the exercises without really knowing what you are doing. The subject matter in this course is also more complex than in previous courses, so more attention needs to be put on really making students understand the fundamentals thorougly. Also, sometimes buggy or inexplicable grader output. Andrew Ng is still a great instructor though.

創建者 Mike L


I have been a big fan of the series. I think it is a must-take series. I took this course when it was freshly released. The materials and programming assignments were quite good from week 1 to 3. However, the week 4 programming assignment was not ready. I encountered a few issues in the autograder and test data loading. I burned some time tracking down them. Fortunately my fellow classmates were very helpful in the forum. I am sure all problems would be solved in coming weeks. Just keep a mental notes.

Having said that, the materials is worth the pain. Go take it!

創建者 Jonathan S Y P


La verdad este curso no me gustó mucho porque fue demasiado teórico y habían partes que uno se perdía de tantas formulas... por ejemplo en la tercera semana había una parte de la formula que decía 3x3x8 y como a los 6 vídeos siguientes, explicaron a que correspondía el valor de 8 (Si se hubiera explicado eso desde el primer vídeo hubiera sido más claro todo desde el principio). Este tipo de temas me parece que es más interesante verlo como un tutorial; donde a medida que se va explicando teoría, se va mostrando como hacerlo en x lenguaje, ya sea, python, c# u otro.

創建者 Foad O


T​he course is pretty good overall. However, the programming assignments need much improvement. I realize that teaching Python syntax and programming is not really part of this course, but if students are expected to do coding, there needs to be some more detailed lessons/sections to cover the basics. While providing vague, inconsistent and riddle-like "hints" in the middle of the programming exercises make for some interesting brain exercises, they are certainly not helpful at teaching the students what they need to know in order to write correct code.

創建者 Rahul G


Wonderful course by Dr. Andrew Ng but it would be even better if the course offered EXECUTION EXERCISES following Google AI courses (see below)

Since many of us want to learn the course material and EXECUTE COMMERCIAL (or SEMI COMMERCIAL CUSTOMIZED) CODES and NOT INTERESTED in PROGRAMMING/CODING please provide GUI driven online execution modules INSTEAD OF PROGRAMMING EXERCISES !


Rahul Gupta

創建者 Amod J


Really liked the course content but the true learning was in the homeworks that had the implementation details. After completing the course I was unable to download my own completed assignments as the course assignments were locked out for me. I don't want to re-submit any of them but I want to download my work to be able to refer to it and learn from it. I can see posts in the forum asking me to download them when the next session of the course becomes available, but I cannot afford to keep on paying ~ $50 subscription until it does.

創建者 Mark P


The content covered is excellent as with the other courses.

However the material in this videos etc have many editing glitches. In addition some of the notebook based programming assignments are misleading and have minor errors that caused auto-grader issues.

In addition the programming assignments seem to be dumbing down. You spend lots of timing solving syntactic nuances of tensorflow, Keras etc rather than being asked to solve cerebral problems that help understanding of the concepts.

創建者 Grant G


This covers hugely important information and really deserves five stars, but it is fundamentally clumsy. Even leaving aside the unprofessional disaster that is the week 4 assignment 2 grader, the difficulty level is all over the place and the description of the style transfer is borderline incomprehensible (possibly because Prof. Ng is trying to soft-pedal the linear algebra?)

Coursera, Prof. Ng, please take a second look at this one. It needs -- and deserves! -- better work.

創建者 Jalaz K


Assignments really need to be improved. Of all the courses in this specialization, this particular course frustrated me a bit. Thanks to the discussion groups, I was able to sail through.

Moreover, Grader should provide the summary of error in our submission rather than just showing wrong submission. Course Material was really good. 5 on 5 for that part, but the assignments really troubled me and others as well, as can be easily seen in the discussion groups.

創建者 Andreas B O


Lectures were great. The descriptions for all applied operations, algorithms, etc. by Andrew are excellent. However, the Programming Assignments this time around demanded a lot of looking up TensorFlow and Keras functions (even during the Keras Tutorial). Especially Week 3 was a struggle for me. At some point, the framework simplicity is turned into rather harsh complexity. A better explanation of what TensorFlow/Keras commands to would be of advantage.

創建者 Asif I


First of all, thank you for providing such a rich content.

I know its hard to strike a balance between covering content and "actually" delivering them to the student. Course #3 and especially #4 felt very rushed when it came to the exercises. The tensorflow concepts that came back out of nowhere and solutions would have been nearly impossible without the copious hints.

PS: Course 4 "happy house" face recognition assignment was choke full of bugs.