The last few days saw me experimenting with one particular data set and different parameters of the SVM regression model for those data. For the data set at hand, I figured epsilon, the width of the error pipe to be 0.3 and the standard deviation of the rbf kernel to be 12. Other kernels won’t work on those data and I’ll have to do a comparison of those results with the number of support vectors that are a further parameter that constitutes the models.
Read the rest of this entry »

The updated script that uses SVMTorch in regression mode uses the cvpartition function from the statistics toolbox in Matlab R2008a, which I happened to install today. Seems that my splitCV script is deprecated now.

Further info: I added a page on the left that provides easy access to some of the matlab scripts that I’ve created so far.

Der von mir verlinkte Artikel zum Precision Farming in der Technology Review ist inzwischen online verfügbar.

Today I have started testing SVM regression models on the agriculture data that I’ve so far used for this year’s neural network publications. There are numerous implementations for SVM regression, some of which may be found at http://www.svms.org/software.html or http://www.support-vector-machines.org/SVM_soft.html.
Read the rest of this entry »

The past six weeks on vacation and at the Milano WCC conference had me sort my ideas into a likely dissertation structure. It is somewhat a follow-up on this AI-2008 announcement article, although the ideas in that blog post are not exactly what ended up being in the conference paper (self-organizing maps).
Read the rest of this entry »

This World Computer Congress 2008 in Milano, Italy, is huge. The gala dinner in the large Milano Convention Centre’s Auditorium seated roughly 1,000 people. Even if there were only 800 there, it still is massive and impressive.

We’ll be leaving tomorrow morning for IFIP-AI 2008 in Milano, Italy. The conference is part of the World Computer Congress. My talk will be on Monday afternoon and I’m going to be chairing my own session there (.pdf program). The slides (.pdf, 1.1MB) are slightly different from the ICDM ones since the work differs slightly, too. Upon returning from this conference, I’ll start working again at University, even though I’m technically still on vacation. There is also the structure of my PhD thesis that needs to be written down which I’ll probably do next week.

In der deutschen September-Ausgabe der Technology Review ist ein fünfseitiger Report mit dem Titel „Gezielt zu mehr Ertrag“ abgedruckt, der wiederum einen guten, allerdings ob der Kürze auch oberflächlichen Eindruck des breit gefächerten Themengebiets Precision Farming bietet. Unter anderem werden die Preagro-Projekte erwähnt sowie Firmen wie Rapid Eye oder Agro-Sat. Abseits des Artikels wurde hauptsächlich aufgrund der hohen Düngerpreise K+S in den DAX aufgenommen, was ein gutes Indiz für die steigende Bedeutung der Landwirtschaft und ihrer Zulieferer ist.