Accord.IO.SparseReader.ReadDense C# (CSharp) Method

        public Tuple<double[], double> ReadDense()
        {
            var sparse = ReadSparse();
            return Tuple.Create(sparse.Item1.ToDense(Dimensions), sparse.Item2);
        }

        public void ReadSampleTest()
        {
            // http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass.html#iris

            MemoryStream file = new MemoryStream(
                Encoding.Default.GetBytes(Accord.Tests.IO.Properties.Resources.iris_scale));

            // Suppose we are going to read a sparse sample file containing
            //  samples which have an actual dimension of 4. Since the samples
            //  are in a sparse format, each entry in the file will probably
            //  have a much lesser number of elements.
            int sampleSize = 4;

            // Create a new Sparse Sample Reader to read any given file,
            //  passing the correct dense sample size in the constructor
            SparseReader reader = new SparseReader(file, Encoding.Default, sampleSize);

            // Declare some variables to receive each current sample
            int label = 0;
            string description;
            double[] sample;

            // Read a sample from the file
            var r = reader.ReadDense();
            sample = r.Item1;
            label = (int)r.Item2;
            description = reader.SampleDescriptions[0];

            Assert.AreEqual(1, label);
            Assert.AreEqual(String.Empty, description);

            Assert.AreEqual(4, sample.Length);
            Assert.AreEqual(-0.555556, sample[0], 0.0001);
            Assert.AreEqual(+0.250000, sample[1], 0.0001);
            Assert.AreEqual(-0.864407, sample[2], 0.0001);
            Assert.AreEqual(-0.916667, sample[3], 0.0001);

            var s = reader.ReadSparse();
            sample = s.Item1.ToSparse();
            label = (int)s.Item2;
            description = reader.SampleDescriptions[0];

            Assert.AreEqual(1, label);
            Assert.AreEqual(String.Empty, description);

            Assert.AreEqual(8, sample.Length);
            Assert.AreEqual(0, sample[0], 0.0001);
            Assert.AreEqual(-0.666667, sample[1], 0.0001);
            Assert.AreEqual(1, sample[2], 0.0001);
            Assert.AreEqual(-0.166667, sample[3], 0.0001);
            Assert.AreEqual(2, sample[4], 0.0001);
            Assert.AreEqual(-0.864407, sample[5], 0.0001);
            Assert.AreEqual(3, sample[6], 0.0001);
            Assert.AreEqual(-0.916667, sample[7], 0.0001);


            int count = 2;

            // Read all samples from the file
            while (!reader.EndOfStream)
            {
                reader.SampleDescriptions.Clear();
                r = reader.ReadDense();
                sample = r.Item1;
                label = (int)r.Item2;
                description = reader.SampleDescriptions[0];
                Assert.IsTrue(label >= 0 && label <= 3);
                Assert.IsTrue(description == String.Empty);
                Assert.AreEqual(4, sample.Length);
                count++;
            }

            Assert.AreEqual(150, count);
        }