Matlab libsvm svmpredict accuracy verbose

Question

I have a question of an annoying fact. I'm using libsvm with matlab and I'am able to predict using:

predicted_label = svmpredict(Ylabel, Xlabel, model);

but it happen that every time I make a predictions appears this:

Accuracy = X% (y/n) (classification)

Which I find annoying because I am repeating this procedure a lot of times and also makes it slow because its displaying in screen.

I think what I want is to avoid that svmpredict being verbose.

Can anyone help me with this? Thanks in advance.

-Jessica

score 7 · Answer 1 · answered Aug 21 '13 at 10:06

7

I found a much better approach than editing the source code of the c library was to use matlabs evalc which places any output to the first output argument.

[~ predicted_label] = evalc('svmpredict(Ylabel, Xlabel, model)');

Because the string to be evaluated is fixed should be no performance decrease.

answered Aug 21 '13 at 10:06

Philliproso

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I found this the easiest and most straight-forward solution – user2208604 Mar 25 '15 at 21:06
Unfortunately this seems to be the only way to achieve this (without recompiling the source). – zelanix May 22 '15 at 16:08

score 6 · Answer 2 · answered Nov 18 '13 at 21:49

6

svmpredict(Ylabel, Xlabel, model, '-q');

From the manual:

Usage: [predicted_label, accuracy, decision_values/prob_estimates] = svmpredict(testing_label_vector, testing_instance_matrix, model, 'libsvm_options')
       [predicted_label] = svmpredict(testing_label_vector, testing_instance_matrix, model, 'libsvm_options')
Parameters:
  model: SVM model structure from svmtrain.
  libsvm_options:
    -b probability_estimates: whether to predict probability estimates, 0 or 1 (default 0); one-class SVM not supported yet
    -q : quiet mode (no outputs)

answered Nov 18 '13 at 21:49

isakkarlsson

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Unfortunately quiet mode still has some outputs. Not no outputs. If you are doing grid based hyper-parameter searches your command line can still get flooded. – Philliproso Mar 26 '15 at 08:09
Not really an answer to the question because this still outputs the `Accuracy = ...` message that the OP was trying to hide. – zelanix May 22 '15 at 16:07

NKN · Accepted Answer · 2013-08-21T08:10:35.107

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If you are using matlab, just find the line of code that is displaying this information (usually using 'disp', 'sprintf', or 'fprintf') and comment it out using the commenting operator %.

example:

disp(['Accuracy= ' num2str(x)]);

change it to:

% disp(['Accuracy= ' num2str(x)]);

If you are using the main libsvm library then you need to modify it before making. 1- Open the file 'svmpredict.c'

2- find this line of code:

info("Accuracy = %g%% (%d/%d) (classification)\n",
(double)correct/total*100,correct,total);

3- just comment it out using // operator

4- save and close the file

5- make the project

edited Aug 21 '13 at 08:10

answered Aug 21 '13 at 07:43

NKN

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In addition to these suggestions, you may take a look at http://stackoverflow.com/questions/3029636/suppressing-a-functions-command-window-output – Marc Claesen Aug 21 '13 at 08:46

Matlab libsvm svmpredict accuracy verbose

3 Answers3