/usr/share/octave/site/m/vlfeat/toolbox/xtest/vl_test_roc.m is in octave-vlfeat 0.9.17+dfsg0-6build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | function results = vl_test_roc(varargin)
% VL_TEST_ROC
vl_test_init ;
function s = setup()
s.scores0 = [5 4 3 2 1] ;
s.scores1 = [5 3 4 2 1] ;
s.labels = [1 1 -1 -1 -1] ;
function test_perfect_tptn(s)
[tpr,tnr] = vl_roc(s.labels,s.scores0) ;
vl_assert_almost_equal(tpr, [0 1 2 2 2 2] / 2) ;
vl_assert_almost_equal(tnr, [3 3 3 2 1 0] / 3) ;
function test_perfect_metrics(s)
[tpr,tnr,info] = vl_roc(s.labels,s.scores0) ;
vl_assert_almost_equal(info.eer, 0) ;
vl_assert_almost_equal(info.auc, 1) ;
function test_swap1_tptn(s)
[tpr,tnr] = vl_roc(s.labels,s.scores1) ;
vl_assert_almost_equal(tpr, [0 1 1 2 2 2] / 2) ;
vl_assert_almost_equal(tnr, [3 3 2 2 1 0] / 3) ;
function test_swap1_tptn_stable(s)
[tpr,tnr] = vl_roc(s.labels,s.scores1,'stable',true) ;
vl_assert_almost_equal(tpr, [1 2 1 2 2] / 2) ;
vl_assert_almost_equal(tnr, [3 2 2 1 0] / 3) ;
function test_swap1_metrics(s)
[tpr,tnr,info] = vl_roc(s.labels,s.scores1) ;
vl_assert_almost_equal(info.eer, 1/3) ;
vl_assert_almost_equal(info.auc, 1 - 1/(2*3)) ;
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