Machine Learning Discussion Group - Dimensionality reduction with PCA

This week Dale will lead a discussion on dimensionality reduction with PCA and related techniques.  We will review geometric and data compression motivations for PCA, and explore methods for calculating these latent aspects.  There will be an introduction to the mathematical principals underlying different decomposition techniques.  Some examples will be shown during the meetup

Useful links for this topic:

Vidoes by Andrew Ng's Coursera class.  Look for videos under Section XIV Dimensionality Reduction (week 8)

Useful papers:

Of course, Wikipedia also has a very complete description of this at

We also want to thank John for his overview on Recommendation Systems and Andrew for his overview on Collaborative Filtering during last week’s meetup.

For those new to this group, the purpose of this meetup is to learn from each other the various aspects of machine learning. Our focus will be on intuitions, theories, and implementations behind machine learning algorithms. The format will be a chosen algorithm or topic reviewed/explained by a pre-assigned member through a highly interactive discussion session, and it is expected that other members will draw from their respective knowledge and experience to contribute to the explanation on the topic. We may also discuss specific machine learning projects should time permits after the chosen topic discussion.

The background of attendees varies from those that have exposure to machine learning, whether through Andrew Ng’s Coursera class or through other learning channels, to those that use machine learning in their day-to-days. However, even if you have no exposure to but have interest in machine learning, you are welcome to attend the meetup. Of course you might get more out of it if you go through the videos in Andrew Ng’s free Coursera class or equivalent.

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  • John P.

    Thanks for the presentation, Dale. Clear and intuitive. Could you share the slides?

    August 17, 2013

  • Vivek

    Bleh... Not Coming...

    August 16, 2013

  • Dale J.

    I just found out that the projectors at the Dojo don't have Mac dongles. Could someone please bring one? Ideally a Mac to VGA one.

    August 15, 2013

  • John B.

    had to change my rsvp so hopefully one of the waiters can get in. too bad, though, cause it sounds interesting.

    1 · August 15, 2013

    • Bill

      Thanks for being considerate and changing your RSVP!

      August 15, 2013

  • John-Mark A.

    Looking forward to ML at the Dojo!

    August 11, 2013

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