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Case Studies: Finding Similar Documents
A reader is interested in a specific news article and you want to find similar articles to recommend. What is the right notion of similarity? Moreover, what if there are millions of other documents? Each time you want to a retrieve a new document, do you need to search through all other documents? How do you group similar documents together? How do you discover new, emerging topics that the documents cover?
In this third case study, finding similar documents, you will examine similarity-based algorithms for retrieval. In this course, you will also examine structured representations for describing the documents in the corpus, including clustering and mixed membership models, such as latent Dirichlet allocation (LDA). You will implement expectation maximization (EM) to learn the document clusterings, and see how to scale the methods using MapReduce.
Learning Outcomes: By the end of this course, you will be able to:
-Create a document retrieval system using k-nearest neighbors.
-Identify various similarity metrics for text data.
-Reduce computations in k-nearest neighbor search by using KD-trees.
-Produce approximate nearest neighbors using locality sensitive hashing.
-Compare and contrast supervised and unsupervised learning tasks.
-Cluster documents by topic using k-means.
-Describe how to parallelize k-means using MapReduce.
-Examine probabilistic clustering approaches using mixtures models.
-Fit a mixture of Gaussian model using expectation maximization (EM).
-Perform mixed membership modeling using latent Dirichlet allocation (LDA).
-Describe the steps of a Gibbs sampler and how to use its output to draw inferences.
-Compare and contrast initialization techniques for non-convex optimization objectives.
-Implement these techniques in Python....

Aug 25, 2016

excellent material! It would be nice, however, to mention some reading material, books or articles, for those interested in the details and the theories behind the concepts presented in the course.

Jan 17, 2017

Excellent course, well thought out lectures and problem sets. The programming assignments offer an appropriate amount of guidance that allows the students to work through the material on their own.

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von João F A d S

•Aug 07, 2016

Great course. Well packed, well explained, nice practical examples, good all around MOOC with of info.

von Omar S

•Jul 12, 2017

I loved this course!

von Fengchen G

•Sep 02, 2016

Awesome course! The session on EM algorithm is revealing!

von Jared C

•Aug 07, 2016

Exceptional course! This is challenging material for me, but it's presented in such a coherent manner that you can't help but absorb it.

von Snehotosh K B

•Dec 03, 2016

Best course available till date as MooC

von krishna k s

•Apr 20, 2018

This is very nice and interesting course. It gives practical application of machine learning application. I would consider this course as applied machine learning course as it lacks mathematical intuition. Nevertheless, course it great and cover major points in the machine learning field.

von Sumit

•Sep 17, 2016

Excellent course

von Miao J

•Jul 01, 2016

Another great course. Strongly recommend!

von Alfred D

•Mar 24, 2018

KD trees, LSH along with LDH were some real deep techniques I've learnt and benefitted.

Thanks a ton to Emily and Carlos , you guys are amazing teachers for such a complex subject as ML and the algorithms it consists of .

von Saqib N S

•Dec 05, 2016

The course dived into basic and advanced concepts of unsupervised learning. As before, Prof Fox did a great job at explaining things.

von Justin K

•Aug 17, 2016

An interesting topic, presented well by the instructor and reinforced by intermediate-level programming assignments.

von Russell H

•Oct 09, 2016

Detailed coverage of several approaches to clustering. Not easy but learned a lot.

von Bruno G E

•Sep 03, 2016

Simply Amazing!

von Ted T

•Jul 29, 2017

Best ML course ever. Easy to understand!

von Nitish V

•Oct 29, 2017

The Course is good . Covered lots of topics .

von Bruno C K

•Aug 25, 2016

excellent material! It would be nice, however, to mention some reading material, books or articles, for those interested in the details and the theories behind the concepts presented in the course.

von Gautam.R

•Oct 08, 2016

Awesome :)

von Robert C

•Feb 16, 2018

Emily was fantastic at explaining difficult to understand concepts. Thoroughly enjoyed the course, and learned quite a lot.

von Jason G

•Aug 09, 2017

Harder than the previous ones, but enjoyable

von clark.bourne

•Jan 09, 2017

内容丰富实际，材料全。

von Uday A

•Aug 13, 2017

Thank you so much, Emily and Carlos! Really liked all the courses, and I daresay these are the best ML courses available online. Very insightful, and also cover the mathematical part of the algorithms. Since there are now just 4 courses in this ML Specialization, I would mostly jump to Andrew Ng's new Deep Learning Specialization for further studies. But will look out for your remaining courses to be available once more. If and when they come out, it would be great to send out a notification. Thanks!

von Li Y S

•Oct 30, 2016

I really learn a lot in this course, although the materials are very difficult at first read, but Emily's explanation were clear and I would be able to get the idea after a few review.

von suryatapa r

•Dec 16, 2016

It's an amazing Course.

von Danylo D

•Dec 06, 2016

Thank you, it was a good one

von Anmol G

•Dec 16, 2016

So Much Concepts to learn and totally worth it!

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