Exemple #1
0
        public void GiniImpurityMetric_Impurity()
        {
            var set1 = new double[] { 0, 1, 2, 3, 4, 3, 2, 1, 0 };
            var set2 = new double[] { 1, 1, 1, 1, 2, 2, 2, 2 };
            var set3 = new double[] { 1, 1, 1, 1, 1, 1, 1, 1 };

            var sut = new GiniImpurityMetric();

            var val1 = sut.Impurity(set1);

            Assert.AreEqual(0.79012345679012341, val1);
            var val2 = sut.Impurity(set2);

            Assert.AreEqual(0.5, val2);
            var val3 = sut.Impurity(set3);

            Assert.AreEqual(0.0, val3);
        }
Exemple #2
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        public void GiniImpurityMetric_Impurity_Weights()
        {
            var set1 = new double[] { 0, 1, 2, 3, 4, 3, 2, 1, 0 };
            var set2 = new double[] { 1, 1, 1, 1, 2, 2, 2, 2 };
            var set3 = new double[] { 1, 1, 1, 1, 1, 1, 1, 1 };

            var weights = new double[] { 3, 1, 4, 1, 0.5, 1, 2, 1, 10 };
            var sut     = new GiniImpurityMetric();

            var val1 = sut.Impurity(set1, weights, Interval1D.Create(0, set1.Length));

            Assert.AreEqual(0.96921684019918519, val1);
            var val2 = sut.Impurity(set2, weights, Interval1D.Create(0, set2.Length));

            Assert.AreEqual(0.82441700960219477, val2);
            var val3 = sut.Impurity(set3, weights, Interval1D.Create(0, set3.Length));

            Assert.AreEqual(0.64883401920438954, val3);
        }
Exemple #3
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        public void GiniImpurityMetric_Impurity_Weights_None()
        {
            var set1 = new double[] { 0, 1, 2, 3, 4, 3, 2, 1, 0 };
            var set2 = new double[] { 1, 1, 1, 1, 2, 2, 2, 2 };
            var set3 = new double[] { 1, 1, 1, 1, 1, 1, 1, 1 };

            var weights = new double[] { 1, 1, 1, 1, 1, 1, 1, 1, 1 };
            var sut     = new GiniImpurityMetric();

            var val1 = sut.Impurity(set1, weights, Interval1D.Create(0, set1.Length));

            Assert.AreEqual(0.79012345679012341, val1);
            var val2 = sut.Impurity(set2, weights, Interval1D.Create(0, set2.Length));

            Assert.AreEqual(0.5, val2);
            var val3 = sut.Impurity(set3, weights, Interval1D.Create(0, set3.Length));

            Assert.AreEqual(0.0, val3);
        }
Exemple #4
0
        public void GiniImpurityMetric_Impurity_Interval()
        {
            var set1 = new double[] { 0, 1, 2, 3, 4, 3, 2, 1, 0 };
            var set2 = new double[] { 1, 1, 1, 1, 2, 2, 2, 2 };
            var set3 = new double[] { 1, 1, 1, 1, 1, 1, 1, 1 };

            var sut      = new GiniImpurityMetric();
            var interval = Interval1D.Create(2, 7);

            var val1 = sut.Impurity(set1, interval);

            Assert.AreEqual(0.64, val1);
            var val2 = sut.Impurity(set2, interval);

            Assert.AreEqual(0.48, val2);
            var val3 = sut.Impurity(set3, interval);

            Assert.AreEqual(0.0, val3);
        }