Tagged Questions

1
vote
2answers
39 views

How to interpret the model parameters of libsvm via MATLAB interface?

I used the MATLAB interface of libsvm for doing binary classification of 997-dimensional training data. I am trying to understand how the resulting model is used to compute the predicted output (which ...
0
votes
0answers
48 views

Issues with sequential feature selection

I am trying to do some feature selection in gene expression data with 22215 features. I followed the tutorial here. I initially applied filter method(ttest) to select the features having the best p ...
1
vote
0answers
138 views

SVM classification step on embedded system with RBF kernel

Since it has been some time when i looked into support vector machines and i am facing now to implement the classification step of a trained svm model i would like to ask whether someone could point ...
1
vote
1answer
96 views

What data from MATLAB's svmstruct are needed for classification in a different language?

As the title already states Iam wondering what data exactly are needed from the MATLAB svmstruct to be able to classify a new instance outside of MATLAB, e.g. in ...
1
vote
2answers
576 views

LibSVM cost weights for unbalanced data doesn't work

I have a data set that number of negative labeled values are 163 times of number of positive labeled values so I have a unbalanced data set. I have tried that: ...
0
votes
0answers
293 views

Bioinformatics's svmtrain using MLP Kernel Function

I am using Bioinformatics's svmtrain, with mlp kernel function for classification. However, I encountered an error when using quadratic programming 'QP' to train. As recommended in the documentation, ...
2
votes
1answer
239 views

How can I classify images as “normal” or “lesions” using SVM?

I want to classify images as "normal" or "lesions", and then rate the images in the lesions category from mild and severe. This classification would be based on edge, color and texture features. For ...
3
votes
1answer
747 views

Nested Cross-Validation for Classification in Matlab

I am trying to tackle a classification problem with Support Vector Machine in Matlab using SVM. Using sample codes in Bioinformatics Toolbox documentation (SVM Classification with Cross Validation) ...
0
votes
1answer
219 views

Most effective SVM implementation for large classes and datasets?

What's the best SVM implementation of SVMs in MATLAB? Right now I'm looking at PEGASOS and SVM-Perf, which both claims to have good performance with large datasets and classes. But there are so many ...
4
votes
3answers
2k views

Best way to perform multiclass SVM

For the past two days, i have been trying to perform multiclass svm. I know that the SVM is actually a binary classifier. I would like to extend it to multi-class SVM. Which is the best way and maybe ...
1
vote
1answer
299 views

Voting in Multi-Class SVM

I am currently trying to classify 6 class of facial expression using SVM. I am using MATLAB and LIBSVM to do my classification. The problem i face is the pred label below produces 0 and 1. It treats ...
2
votes
1answer
884 views

Output of linear SVM model in Matlab using SVM-light

I am using SVM-light with Matlab, for linear SVM. I would like to understand the output model, but I cannot find any documentation or help about it. Here is the output: ...