Accord.Tests.MachineLearning.C45LearningTest.RunTest C# (CSharp) Method

        public void RunTest()
        {
            DecisionTree tree;
            double[][] inputs;
            int[] outputs;

            CreateMitchellExample(out tree, out inputs, out outputs);

            Assert.AreEqual(1, tree.Root.Branches.AttributeIndex); // Temperature
            Assert.AreEqual(2, tree.Root.Branches.Count);
            Assert.IsNull(tree.Root.Output);
            Assert.IsNull(tree.Root.Value);

            Assert.AreEqual(84, tree.Root.Branches[0].Value); // Temperature <= 84.0
            Assert.AreEqual(0, tree.Root.Branches[0].Branches.AttributeIndex); // Decide over Outlook
            Assert.AreEqual(ComparisonKind.LessThanOrEqual, tree.Root.Branches[0].Comparison);
            Assert.AreEqual(3, tree.Root.Branches[0].Branches.Count);
            Assert.IsFalse(tree.Root.Branches[0].Branches[0].IsLeaf);
            Assert.IsTrue(tree.Root.Branches[0].Branches[1].IsLeaf);
            Assert.IsFalse(tree.Root.Branches[0].Branches[2].IsLeaf);

            Assert.AreEqual(84, tree.Root.Branches[1].Value); // Temperature > 84.0
            Assert.AreEqual(0, tree.Root.Branches[1].Output.Value); // Output is "No"
            Assert.AreEqual(ComparisonKind.GreaterThan, tree.Root.Branches[1].Comparison);
            Assert.IsNotNull(tree.Root.Branches[1].Branches);
            Assert.AreEqual(0, tree.Root.Branches[1].Branches.Count);
            Assert.IsTrue(tree.Root.Branches[1].IsLeaf);

            Assert.AreEqual(0, tree.Root.Branches[0].Branches[0].Value); // Temperature <= 84.0 && Outlook == 0
            Assert.AreEqual(ComparisonKind.Equal, tree.Root.Branches[0].Branches[0].Comparison);
            Assert.AreEqual(2, tree.Root.Branches[0].Branches[0].Branches.AttributeIndex); // Decide over Humidity
            Assert.AreEqual(72.5, tree.Root.Branches[0].Branches[0].Branches[0].Value);
            Assert.AreEqual(72.5, tree.Root.Branches[0].Branches[0].Branches[1].Value);
            Assert.IsTrue(tree.Root.Branches[0].Branches[0].Branches[0].IsLeaf);
            Assert.IsTrue(tree.Root.Branches[0].Branches[0].Branches[1].IsLeaf);
            Assert.AreEqual(ComparisonKind.LessThanOrEqual, tree.Root.Branches[0].Branches[0].Branches[0].Comparison);
            Assert.AreEqual(ComparisonKind.GreaterThan, tree.Root.Branches[0].Branches[0].Branches[1].Comparison);

            Assert.AreEqual(2, tree.Root.Branches[0].Branches[2].Value); // Temperature <= 84.0 && Outlook == 2
            Assert.AreEqual(ComparisonKind.Equal, tree.Root.Branches[0].Branches[2].Comparison);
            Assert.AreEqual(3, tree.Root.Branches[0].Branches[2].Branches.AttributeIndex); // Decide over Wind
            Assert.AreEqual(0, tree.Root.Branches[0].Branches[2].Branches[0].Value);
            Assert.AreEqual(1, tree.Root.Branches[0].Branches[2].Branches[1].Value);
            Assert.IsTrue(tree.Root.Branches[0].Branches[2].Branches[0].IsLeaf);
            Assert.IsTrue(tree.Root.Branches[0].Branches[2].Branches[1].IsLeaf);
            Assert.AreEqual(ComparisonKind.Equal, tree.Root.Branches[0].Branches[2].Branches[0].Comparison);
            Assert.AreEqual(ComparisonKind.Equal, tree.Root.Branches[0].Branches[2].Branches[1].Comparison);
        }