AdaBoost, Adaptive Boosting, is a well-known meta machine learning algorithm that was proposed by Yoav Freund and Robert Schapire. In this project there two main files
to traing and test a user-coded learning (classification) algorithm with AdaBoost. A demo file (demo.m) is provided that demonstrates how these two files can be used with a classifier (basic threshold classifier) for two class classification problem.
Could somebody explain how exactly weights of samples are used?
For example for training sample x1=[a1,.., an]. How the x1 will change after applying the initial weight of 1/m? Is the x1 going to change to [a1/m,...,an/m]?
im using this adaboost toolbox. I hv to use the SVM as weak base classsifier. but have no idea how to use it or in what format i'll write the SVM so that I'll be able to use it in adaboost function..?? Is there anybody to help me out??.. just need to know in what format I would write SVM for adaboost
I am using your toolbox for boosting SVM as the weak classifier. But I found out that the class likelihoods are needed for your method, but all I have for SVM output are the predicted labels, is there any way to solve this?
I think you mean GML Adaboost (>one from Russia) right?
Actully, I was trying to use it for couple of days without any success.
I see ... this is the case... the number of samples I use are less than the number of dimensions.
Could you let us know If you have any idea to update the code to deal with this case.
26 Sep 2008
I recommend the one from Russia, but than one has error too. it works for the data with Dimension smaller than Number of samples the code must be changed from length to size because in some cases such as face recognition D is larger than N.
11 Sep 2008
Still the Algorithm is not up to the mark. its really old one. too much imrproved versions are there.
04 Sep 2008
The formula does not look familiar; the reference, which you have to look for, does not either. Existence of several versions of the algorithm seems to be lost on the author. I would recommend Googling a well-documented 'Adaboost toolbox' by a guy from Moscow State University.