[Test()] public void TestCreate()
{
var sparse_boolean_matrix = new SparseBooleanMatrix();
sparse_boolean_matrix[0, 1] = true;
sparse_boolean_matrix[0, 4] = true;
sparse_boolean_matrix[1, 0] = true;
sparse_boolean_matrix[1, 2] = true;
sparse_boolean_matrix[1, 4] = true;
sparse_boolean_matrix[3, 1] = true;
sparse_boolean_matrix[3, 3] = true;
sparse_boolean_matrix[3, 4] = true;
var correlation_matrix = new BinaryCosine(sparse_boolean_matrix.NumberOfRows);
correlation_matrix.ComputeCorrelations(sparse_boolean_matrix);
Assert.AreEqual(4, correlation_matrix.NumberOfRows);
Assert.IsTrue(correlation_matrix.IsSymmetric);
Assert.AreEqual(1 / Math.Sqrt(6), correlation_matrix[0, 1], DELTA);
Assert.AreEqual(1 / Math.Sqrt(6), correlation_matrix[1, 0], DELTA);
Assert.AreEqual(1 / 3d, correlation_matrix[1, 3], DELTA);
Assert.AreEqual(0f, correlation_matrix[2, 0]);
Assert.AreEqual(0f, correlation_matrix[2, 1]);
Assert.AreEqual(1f, correlation_matrix[2, 2]);
Assert.AreEqual(0f, correlation_matrix[2, 3]);
Assert.AreEqual(0f, correlation_matrix[0, 2]);
Assert.AreEqual(0f, correlation_matrix[1, 2]);
Assert.AreEqual(0f, correlation_matrix[3, 2]);
}
///
public override void LearnAttributeToFactorMapping()
{
BinaryCosine cosine_correlation = new BinaryCosine(MaxItemID + 1);
Console.Error.WriteLine("training with max_item_id={0}", MaxItemID);
cosine_correlation.ComputeCorrelations(item_attributes);
this.item_correlation = cosine_correlation;
_MapToLatentFactorSpace = Utils.Memoize <int, float[]>(__MapToLatentFactorSpace);
}
///
protected override void RetrainUser(int user_id)
{
base.RetrainUser(user_id);
if (UpdateUsers)
{
for (int i = 0; i <= MaxUserID; i++)
{
correlation[user_id, i] = BinaryCosine.ComputeCorrelation(new HashSet <int>(data_user[user_id]), new HashSet <int>(data_user[i]));
}
}
}
///
protected override void RetrainItem(int item_id)
{
base.RetrainUser(item_id);
if (UpdateItems)
{
for (int i = 0; i <= MaxItemID; i++)
{
correlation[item_id, i] = BinaryCosine.ComputeCorrelation(new HashSet <int>(data_item[item_id]), new HashSet <int>(data_item[i]));
}
}
}
///
public override void Train()
{
correlation = BinaryCosine.Create(user_attributes);
int num_users = user_attributes.NumberOfRows;
this.nearest_neighbors = new int[num_users][];
for (int u = 0; u < num_users; u++)
{
nearest_neighbors[u] = correlation.GetNearestNeighbors(u, k);
}
}
///
public override void Train()
{
this.correlation = BinaryCosine.Create(Feedback.UserMatrix);
int num_users = MaxUserID + 1;
this.nearest_neighbors = new int[num_users][];
for (int u = 0; u < num_users; u++)
{
nearest_neighbors[u] = correlation.GetNearestNeighbors(u, k);
}
}
///
public override void Train()
{
correlation = BinaryCosine.Create(Feedback.ItemMatrix);
int num_items = MaxItemID + 1;
this.nearest_neighbors = new int[num_items][];
for (int i = 0; i < num_items; i++)
{
nearest_neighbors[i] = correlation.GetNearestNeighbors(i, k);
}
}
[Test()] public void TestComputeCorrelation()
{
// create test objects
var vector1 = new HashSet <int>();
vector1.Add(0);
vector1.Add(2);
vector1.Add(4);
var vector2 = new HashSet <int>();
vector2.Add(1);
vector2.Add(3);
vector2.Add(4);
// test
Assert.AreEqual(Math.Round(1 / 3d, 4), Math.Round(BinaryCosine.ComputeCorrelation(vector1, vector2), 4));
}
[Test()] public void TestComputeCorrelation()
{
var vector1 = new HashSet <int>();
vector1.Add(0);
vector1.Add(2);
vector1.Add(4);
var vector2 = new HashSet <int>();
vector2.Add(1);
vector2.Add(3);
vector2.Add(4);
var cosine = new BinaryCosine(4);
Assert.AreEqual(1 / 3f, cosine.ComputeCorrelation(vector1, vector2), DELTA);
Assert.AreEqual(0f, cosine.ComputeCorrelation(vector1, new HashSet <int>()), DELTA);
}
[Test()] public void TestComputeCorrelations()
{
var sparse_boolean_matrix = new SparseBooleanMatrix();
sparse_boolean_matrix[0, 1] = true;
sparse_boolean_matrix[0, 4] = true;
sparse_boolean_matrix[1, 0] = true;
sparse_boolean_matrix[1, 2] = true;
sparse_boolean_matrix[1, 4] = true;
sparse_boolean_matrix[3, 1] = true;
sparse_boolean_matrix[3, 3] = true;
sparse_boolean_matrix[3, 4] = true;
var correlation = new BinaryCosine(4);
correlation.ComputeCorrelations(sparse_boolean_matrix);
Assert.AreEqual(1 / Math.Sqrt(6), correlation[0, 1], DELTA);
Assert.AreEqual(1 / Math.Sqrt(6), correlation[1, 0], DELTA);
Assert.AreEqual(1 / 3d, correlation[1, 3], DELTA);
}
[Test()] public void TestCreate()
{
// create test objects
var sparse_boolean_matrix = new SparseBooleanMatrix();
sparse_boolean_matrix[0, 1] = true;
sparse_boolean_matrix[0, 4] = true;
sparse_boolean_matrix[1, 0] = true;
sparse_boolean_matrix[1, 2] = true;
sparse_boolean_matrix[1, 4] = true;
sparse_boolean_matrix[3, 1] = true;
sparse_boolean_matrix[3, 3] = true;
sparse_boolean_matrix[3, 4] = true;
// test
var correlation_matrix = BinaryCosine.Create(sparse_boolean_matrix);
Assert.AreEqual(Math.Round(1 / Math.Sqrt(6), 4), Math.Round(correlation_matrix[0, 1], 4));
Assert.AreEqual(Math.Round(1 / Math.Sqrt(6), 4), Math.Round(correlation_matrix[1, 0], 4));
Assert.AreEqual(Math.Round(1 / 3d, 4), Math.Round(correlation_matrix[1, 3], 4));
}
///
public override void Train()
{
base.Train();
this.correlation = BinaryCosine.Create(user_attributes);
}
///
public override void Train()
{
base.Train();
this.correlation = BinaryCosine.Create(data_user);
}
///
public override void Train()
{
base.Train();
this.correlation = BinaryCosine.Create(data_item);
this.GetPositivelyCorrelatedEntities = Utils.Memoize <int, IList <int> >(correlation.GetPositivelyCorrelatedEntities);
}