variable called "acts" in test_svm.m

[enoch...@gmail.com]

Hello, I'm trying to use svm as my classifier, and I tried using train_svm.m and test_svm.m instead of the train_bp.m and test_bp.m from the introductory tutorial.

However, I get an error because in running perfmet_maxclass, the acts argument is empty.

In fact, acts is just '' at that point.

After examining test_svm.m, I found out why. Following is taken from test_svm.m:

acts = zeros(size(testtargs));

sanity_check(testpats,testtargs,scratch);

test_max_idx(test_max_idx == 1) = 1;

test_max_idx(test_max_idx == 2) = -1;

% Now test generalization performance on the test data

[scratch.err, scratch.predictions] = svmclassify(testpats',test_max_idx',scratch.model);

acts = '';

Instead of setting acts as an nOuts x nTestTimepoints matrix that contains the activations of the output units at test as it is supposed to do,

test_svm.m simply does acts = '';

What needs to be done if I want to use test_svm.m right?

Thank you. 

[Greg Detre]

I don't have access to a running copy of Matlab to inspect, but you could try looking at the contents of scratch.predictions. That sounds like it could be what you're looking for. Good luck!

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Greg Detre

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[Jeff Johnson]

My MATLAB finds the test_svm function in \contrib\learn\ first, which has this in place of that "acts = ";" line:

acts = scratch.predictions';

acts=[acts;acts];

The version of test_svm in \core\learn\ is like yours, so maybe you can change it if MATLAB is using that one.