Double Header with John Myles White and Tal Galili

  • September 17, 2013 · 6:15 PM

We have an amazing two-for this month, John Myles White and Tal Galili.

First up we have Tal:

Creating beautiful trees of clusterings with R (+a bonus)

Tal Galili, the founder of R-bloggers (and also a PhD student of statistics), will present his recent work on the package "dendextend" - intended for visualizing and comparing trees of heirarchical clusterings (a.k.a: dendrograms) with R.

There will be a short overview of the "dendrogram" object in R and its manipulation with the "dendextend" package. From this talk you will know how to create, change, visualize, and statistically compare two trees of heirarchical clusterings (with some sprinkles of Rcpp).

The "bonus talk" in this meetup will be the 5-minutes lightining talk Tal gave in the recent useR!2013 conference about how to quickly update R on windows/mac, using the 'installr' package.

Then we have John:

Streaming Data Analysis and Online Learning

John Myles White is one of the primary developers of Julia, a new language for technical computing. John is currently developing the statistical and machine learning infrastructure for Julia.  In addition, he is one of the residents at Hacker School's Summer 2013 program. John recently finished his Ph.D. at Princeton, where he developed models of human decision-making. During grad school, John co-wrote Machine Learning for Hackers and Bandit Algorithms for Website. Starting in the fall, John will be a research scientist at Facebook.

Traditional statistical software suites are specialized for analyzing data sets that can fit in RAM. But many modern applications require that we analyze much larger data sets. In this talk, I'll survey some of the basic methods for analyzing data in a streaming manner. I'll focus on using stochastic gradient descent (SGD) to fit models to data sets that arrive in small chunks. I'll discus some basic implementation issues and demonstrate the effectiveness of SGD for problems like linear and logistic regression as well as matrix factorization. I'll also describe how these methods allow ML systems to adapt to user data in real-time.

Pizza begins at 6:15, the speakers at 7 then we'll head to the bar whenever we finish.

Please arrive early to grab a seat.  We understand space is an issue and we are doing our best to handle the situation.  Please help us out by RSVPing as soon as you can.

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  • Georgette

    Excellent speakers with a good balance of programming and analysis methods.

    1 · September 18, 2013

  • Christina G.

    great talks. could the speakers post their GitHub repos for the slides and/or code here?

    September 18, 2013

  • Christina G.

    excellent & very relevant

    September 18, 2013

    • Tal G.

      Thank you Christina.

      September 18, 2013

  • Tal G.

    Hello all,
    It was a pleasure for me to see so many of you last night!
    I enjoyed Jon's talk, and feel grateful to Jared for inviting me to give my talk.

    If you are interested in my work, you will find links to the slides and code for my new dendrogram package - dendextend - on github:

    You can also download and play with the installr package which is on CRAN:
    And read the latest news on this package on my blog:

    If you have any further questions you are welcome to e-mail me at:

    I hope to see and meet each of you in the future.

    Take care,
    Tal Galili

    2 · September 18, 2013

  • jennifer z.

    Hi can I join this group without using my fb picture?

    September 18, 2013

  • Aaron H.


    September 17, 2013

  • Jeroen J.

    Great talks! Thanks!

    September 17, 2013

  • Kim S.

    There is a knewton-guest network.

    September 17, 2013

  • Femi A.

    Ok so no free wifi 2nite..

    September 17, 2013

  • Femi A.

    How does one access the wifi ?

    September 17, 2013

  • John C.

    Have to cancel at last minute due to family. See you next time.

    September 17, 2013

  • Bryant C.

    Will there be a video of the presentation? I RSVP'd but something seems to have come up and I may not be able to attend.

    1 · September 3, 2013

    • Jared L.­ carries it and it will be available on g33ktalk a few weeks after.

      September 3, 2013

    • Bryant C.

      Thank you, Jared.

      September 3, 2013

  • A former member
    A former member


    August 31, 2013

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