[IAEP] Feedback request for new SOM variant

Frederick Grose fgrose at gmail.com
Sun Feb 1 16:00:30 EST 2009

Gary, I enjoy this feature.  Do you have a narrative of the map assembly to
By density, do you mean the strength of association of the word among all
others in the set?
The topography of the two images certainly changes my sequence of
examination for the same data.  From the first map, if 'irc' & 'freenode'
are most associated with the week's words, perhaps words from the post
headers should be considered among the junk words.

Thank you for your contributions!


On Sat, Jan 31, 2009 at 9:12 PM, Gary C Martin <gary at garycmartin.com> wrote:

> I've been putting in some more time on the SOM code the last couple of
> weeks (high resolution contour lines being one improvement). I wanted to
> bounce 2 (rather low-res) maps of this weeks IAEP content off the list for
> feedback. The first (2009-January-24-30-3-mean) uses the same fully
> normalised procedure as per the last month of maps (i.e height == term link
> density); the second (2009-January-24-30-3-corrected) has an identical
> cluster layout, but has its topographic height re-adjusted to bring back in
> the term frequency (i.e height == term link density * term frequency). I
> think this 2nd map gives us the undistorted term layout as seen in maps of
> the past month, while allowing term frequency to have some influence again
> over the topography (maps last year all had term frequency frequency).
> Best of both worlds?
> I'd like to roll with the new version (2009-January-24-30-3-corrected), any
> strong opinions/objections? I'm not sure who is looking/using these (the
> main goal for them was as an overview and/or allow reflection of the
> previous week's discussion).
> Regards,
> --Gary
> P.S. Two maps below are identical other than the topographic colorisation
> and a different auto-selected centre point.
> P.P.S Past SOMs and information at http://sugarlabs.org/go/Sugar_Labs/SOM
> _______________________________________________
> IAEP -- It's An Education Project (not a laptop project!)
> IAEP at lists.sugarlabs.org
> http://lists.sugarlabs.org/listinfo/iaep
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