libsvm Questions
3
Solved
I know that LIBSVM only allows one-vs-one classification when it comes to multi-class SVM. However, I would like to tweak it a bit to perform one-against-all classification. I have tried to perform...
Motorman asked 21/1, 2012 at 13:26
3
Solved
libsvm and liblinear are both software libraries that implement Support Vector Machines. What's the difference? And how do the differences make liblinear faster than libsvm?
Paederast asked 16/7, 2012 at 16:46
1
Solved
I wanted to use this classifier in other computer without had to train it again.
I used to save some classifiers from scikit with cPickle.
Doing the same with LIBSVM it gives me a " ValueError: cty...
1
I am using libsvm with precomputed kernels. I generated a precomputed kernel file for the example data set heart_scale and executed the function svmtrain(). It worked properly and the support vecto...
Savonarola asked 11/6, 2012 at 10:19
2
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I'm new to SVM. I used Libsvm for Matlab, and after a prediction phase I've got a decision values array. From SVM theory: each test record z is assigned as positive if
f(z)=1
where f(z) is de...
Coheman asked 14/6, 2012 at 9:28
1
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libsvm's "grid.py" try to optimize only two parameters "c" and "g" of svm-train. I wanted to extend "grid.py" to optimize for other parameters (for example "r" or "d") by running "grid.py" again an...
1
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How can find what the vector w is, i.e. the perpendicular to the separation plane?
2
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I know that Cross validation is used for selecting good parameters. After finding them, i need to re-train the whole data without the -v option.
But the problem i face is that after i train with -...
Peridot asked 28/1, 2012 at 17:48
3
Any way to export a python array into SVM light format?
Teeming asked 15/2, 2012 at 20:53
2
I am using libsvm for multi-class classification. How can I attach classification scores, to compare the confidence of classification, with the output for a given sample as:
Class 1: score1
Class...
Boarer asked 18/6, 2011 at 12:26
1
Solved
I'm working with libsvm and I must implement the classification for multiclasses with one versus all.
How can I do it?
Does libsvm version 2011 use this?
I think that my question is not ...
Bridle asked 28/1, 2012 at 0:9
1
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I am already able to run the examples in the LibSVM package. Now i need to carry out the ten-fold cross validation(MATLAB) on a data set. How do i go about doing it?
Smacking asked 6/1, 2012 at 21:36
1
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I am calling an R function from the R package e1071 which is interfaced with libsvm (a C program). This function is passing C (printf) warning messages to the R console. I know this because the war...
1
Solved
I am new to matlab and don't know how to use libsvm. Is there any sample code for classifying some data (with 2 features) with a SVM and then visualize the result? How about with kernel (RBF, Polyn...
Flaunty asked 19/12, 2011 at 2:0
1
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I have trained a bunch of RBF SVMs using scikits.learn in Python and then Pickled the results. These are for image processing tasks and one thing I want to do for testing is run each classifier on ...
Polynesia asked 2/12, 2011 at 17:31
1
Solved
Looking for tutorials and/or sample code for libSVM's C++ interface.
Specifically, I want to classify features extracted by using SIFT or SURF feature descriptors.
I have tried looking on the webs...
Patrimony asked 14/11, 2011 at 13:23
2
I am trying libsvm and I follow the example for training a svm on the heart_scale data which comes with the software. I want to use a chi2 kernel which I precompute myself. The classification rate ...
Ancheta asked 24/8, 2011 at 15:5
1
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I am interested in test the SVM performance to classify several individuals into four groups/classes. When using the svmtrain LibSVM function from MATLAB, I am able to get the three equations used ...
Olio asked 12/9, 2011 at 15:20
1
Solved
I'm currently working on classifying images with different image-descriptors. Since they have their own metrics, I am using precomputed kernels. So given these NxN kernel-matrices (for a total of N...
Precedence asked 10/10, 2011 at 15:28
2
Solved
Nominally a good problem to have, but I'm pretty sure it is because something funny is going on...
As context, I'm working on a problem in the facial expression/recognition space, so getting 100% ...
Lutestring asked 23/8, 2011 at 0:21
3
Solved
I am trying to use SVM for News article classification.
I created a table that contains the features (unique words found in the documents) as rows.
I created weight vectors mapping with these feat...
Marylouisemaryly asked 20/4, 2011 at 13:34
2
I want to represent a set of labelled instances (data) in a file to be fed in to LibSVM as training data. For the problem mentioned in this question. It will include,
Login date
Login time
Locat...
Municipality asked 13/3, 2011 at 18:51
1
Solved
I am planning on using LibSVM to predict user authenticity in web applications.
(1) Collect Data on particular user behavior(eg. LogIn time, IP Address, Country etc.)
(2) Use Collected Data to trai...
Cimmerian asked 10/3, 2011 at 18:8
2
unfortunately I have problems using predict() in the following simple example:
library(e1071)
x <- c(1:10)
y <- c(0,0,0,0,1,0,1,1,1,1)
test <- c(11:15)
mod <- svm(y ~ x, kernel = "li...
4
I've been searching the net for ~3 hours but I couldn't find a solution yet. I want to give a precomputed kernel to libsvm and classify a dataset, but:
How can I generate a precomputed kernel? (f...
Phatic asked 19/3, 2010 at 1:32
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