///
public override void LoadModel(string filename)
{
using (StreamReader reader = Recommender.GetReader(filename, this.GetType()))
{
CorrelationMatrix correlation = CorrelationMatrix.ReadCorrelationMatrix(reader);
base.Train(); // train baseline model
this.correlation = new BinaryCosine(correlation);
}
}
public void TestWrite()
{
// create a test CorrelationMatrix
var matrix = new CorrelationMatrix(3);
float[] row1 = { 1f, 0.1f, 0.2f };
float[] row2 = { 0.1f, 1f, 0.3f };
float[] row3 = { 0.2f, 0.3f, 1f };
matrix.SetRow(0, row1);
matrix.SetRow(1, row2);
matrix.SetRow(2, row3);
// test
string filename = "testCorrelationMatrixWriter.txt";
var writer = new StreamWriter(filename);
matrix.Write(writer);
writer.Close();
var reader1 = new StreamReader(filename);
Assert.AreEqual("3", reader1.ReadLine().Trim());
Assert.AreEqual("0 1 0.1", reader1.ReadLine().Trim());
Assert.AreEqual("0 2 0.2", reader1.ReadLine().Trim());
Assert.AreEqual("1 2 0.3", reader1.ReadLine().Trim());
var reader2 = new StreamReader(filename);
var corr_matrix = CorrelationMatrix.ReadCorrelationMatrix(reader2);
Assert.AreEqual(1f, corr_matrix[0, 0]);
Assert.AreEqual(0.1f, corr_matrix[0, 1]);
Assert.AreEqual(0.2f, corr_matrix[0, 2]);
Assert.AreEqual(0.1f, corr_matrix[1, 0]);
Assert.AreEqual(1f, corr_matrix[1, 1]);
Assert.AreEqual(0.3f, corr_matrix[1, 2]);
Assert.AreEqual(0.2f, corr_matrix[2, 0]);
Assert.AreEqual(0.3f, corr_matrix[2, 1]);
Assert.AreEqual(1f, corr_matrix[2, 2]);
// close streams and delete the text file
reader1.Close();
reader2.Close();
//File.Delete(filename);
}
///
public override void LoadModel(string filename)
{
using (StreamReader reader = Recommender.GetReader(filename, this.GetType()))
{
int num_users = int.Parse(reader.ReadLine());
var nearest_neighbors = new int[num_users][];
for (int u = 0; u < nearest_neighbors.Length; u++)
{
string[] numbers = reader.ReadLine().Split(' ');
nearest_neighbors[u] = new int[numbers.Length];
for (int i = 0; i < numbers.Length; i++)
{
nearest_neighbors[u][i] = int.Parse(numbers[i]);
}
}
this.correlation = CorrelationMatrix.ReadCorrelationMatrix(reader);
this.k = (uint)nearest_neighbors[0].Length;
this.nearest_neighbors = nearest_neighbors;
}
}
public void TestReadCorrelationMatrix()
{
// create test object
const string filename = "correlation_matrix.txt";
var writer = new StreamWriter(filename);
writer.WriteLine(3);
writer.WriteLine("0 1 0.1");
writer.WriteLine("0 2 0.2");
writer.WriteLine("1 2 0.3");
writer.Close();
var reader = new StreamReader(filename);
var corr_matrix = CorrelationMatrix.ReadCorrelationMatrix(reader);
Assert.AreEqual(1f, corr_matrix[0, 0]);
Assert.AreEqual(1f, corr_matrix[1, 1]);
Assert.AreEqual(1f, corr_matrix[2, 2]);
Assert.AreEqual(0.1f, corr_matrix[0, 1]);
Assert.AreEqual(0.1f, corr_matrix[1, 0]);
Assert.AreEqual(0.2f, corr_matrix[0, 2]);
Assert.AreEqual(0.2f, corr_matrix[2, 0]);
Assert.AreEqual(0.3f, corr_matrix[1, 2]);
Assert.AreEqual(0.3f, corr_matrix[2, 1]);
// TODO test Exception
// test with wrong format
// close streams an delete the text file
reader.Close();
//File.Delete(filename);
}