Accord.Tests.Statistics.LogisticRegressionAnalysisTest.learn2 C# (CSharp) Method

        public void learn2()
        {
            // Test instance 01
            double[][] trainInput =
            {
               new double[] { 1, 1 },
               new double[] { 0, 0 },
            };

            double[] trainOutput = { 1, 0 };
            double[] testInput = { 0, 0.2 };

            var target = new LogisticRegressionAnalysis();

            target.Regularization = 1e-10;

            var regression = target.Learn(trainInput, trainOutput);
            Assert.AreSame(regression, target.Regression);

            double[] coef = target.Coefficients.Apply(x => x.Value);
            Assert.AreEqual(coef[0], -19.360661491141897, 1e-6);
            Assert.AreEqual(coef[1], 19.702873967721807, 1e-6);
            Assert.AreEqual(coef[2], 19.702873967721807, 1e-6);

            double output = target.Regression.Score(testInput);
            Assert.AreEqual(0, output, 1e-6);

            // Test instance 02
            trainInput = new double[][]
            {
                new double[] { 1, 0, 1, 1, 0, 1, 1, 0, 1, 0 },
                new double[] { 0, 1, 0, 1, 1, 0, 1, 1, 0, 1 },
                new double[] { 1, 1, 0, 0, 1, 1, 0, 1, 1, 1 },
                new double[] { 1, 0, 1, 1, 0, 1, 1, 0, 1, 0 },
                new double[] { 0, 1, 0, 1, 1, 0, 1, 1, 0, 1 },
                new double[] { 1, 1, 0, 0, 1, 1, 0, 1, 1, 1 },
            };

            trainOutput = new double[6] { 1, 1, 0, 0, 1, 1 };

            target = new LogisticRegressionAnalysis();

            regression = target.Learn(trainInput, trainOutput);

            double[] actual = regression.Score(trainInput);
            double[] expected = { 0.500000000158903, 0.999999998410966, 0.500000000913694, 0.500000000158903, 0.999999998410966, 0.500000000913694 };
            Assert.IsTrue(actual.IsEqual(expected, 1e-6));

            coef = target.Coefficients.Apply(x => x.Value);
            //string str = coef.ToCSharp();
            expected = new double[] { 1.86680346470929, -3.87720719574071, 2.44120453079343, -0.574401066088034, 5.16960959435804, 2.44120453079343, -3.87720719574087, 5.16960959435804, 2.44120453079343, -3.87720719574087, 2.44120453079343 };
            Assert.IsTrue(coef.IsEqual(expected, 1e-6));
        }