Accord.Tests.MachineLearning.ID3LearningTest.learn_test_automatic C# (CSharp) Method

        public void learn_test_automatic()
        {
            int[][] inputs =
            {
                new int[] { 0, 0 },
                new int[] { 0, 1 },
                new int[] { 1, 0 },
                new int[] { 1, 1 },
            };

            int[] outputs = // xor
            {
                0,
                1,
                1,
                0
            };

            ID3Learning teacher = new ID3Learning();

            var tree = teacher.Learn(inputs, outputs);

            double error = teacher.ComputeError(inputs, outputs);

            Assert.AreEqual(0, error);

            Assert.AreEqual(0, tree.Root.Branches.AttributeIndex); // x
            Assert.AreEqual(2, tree.Root.Branches.Count);
            Assert.IsNull(tree.Root.Value);
            Assert.IsNull(tree.Root.Value);

            Assert.AreEqual(0.0, tree.Root.Branches[0].Value); // x = [0]
            Assert.AreEqual(1.0, tree.Root.Branches[1].Value); // x = [1]

            Assert.AreEqual(tree.Root, tree.Root.Branches[0].Parent);
            Assert.AreEqual(tree.Root, tree.Root.Branches[1].Parent);

            Assert.AreEqual(2, tree.Root.Branches[0].Branches.Count);
            Assert.AreEqual(2, tree.Root.Branches[1].Branches.Count);

            Assert.IsTrue(tree.Root.Branches[0].Branches[0].IsLeaf);
            Assert.IsTrue(tree.Root.Branches[0].Branches[1].IsLeaf);

            Assert.IsTrue(tree.Root.Branches[1].Branches[0].IsLeaf);
            Assert.IsTrue(tree.Root.Branches[1].Branches[1].IsLeaf);

            Assert.AreEqual(0.0, tree.Root.Branches[0].Branches[0].Value); // y = [0]
            Assert.AreEqual(1.0, tree.Root.Branches[0].Branches[1].Value); // y = [1]

            Assert.AreEqual(0.0, tree.Root.Branches[1].Branches[0].Value); // y = [0]
            Assert.AreEqual(1.0, tree.Root.Branches[1].Branches[1].Value); // y = [1]

            Assert.AreEqual(0, tree.Root.Branches[0].Branches[0].Output); // 0 ^ 0 = 0
            Assert.AreEqual(1, tree.Root.Branches[0].Branches[1].Output); // 0 ^ 1 = 1
            Assert.AreEqual(1, tree.Root.Branches[1].Branches[0].Output); // 1 ^ 0 = 1
            Assert.AreEqual(0, tree.Root.Branches[1].Branches[1].Output); // 1 ^ 1 = 0
        }