MyMediaLite
3.03
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Class for storing and computing the co-counts. More...
Public Member Functions | |
void | AddEntity (int entity_id) |
Add an entity to the ICorrelationMatrix by growing it to the requested size. | |
float | ComputeCorrelation (ICollection< int > vector_i, ICollection< int > vector_j) |
Computes the correlation of two binary vectors. | |
void | ComputeCorrelations (IBooleanMatrix entity_data) |
Compute the correlations from an implicit feedback, positive-only dataset. | |
Cooccurrence (int num_entities) | |
Creates an object of type Cooccurrence. | |
override IMatrix< T > | CreateMatrix (int num_rows, int num_columns) |
Create a matrix with a given number of rows and columns. | |
override void | Resize (int size) |
Resize to the given size. | |
void | Resize (int num_rows, int num_cols) |
Grows or shrinks the matrix to the requested size, if necessary. | |
SparseMatrix (int num_rows, int num_cols) | |
Create a sparse matrix with a given number of rows. | |
SymmetricSparseMatrix (int dimension) | |
Create a symmetric sparse matrix with a given dimension. | |
virtual IMatrix< T > | Transpose () |
Get the transpose of the matrix, i.e. a matrix where rows and columns are interchanged. | |
void | Write (StreamWriter writer) |
Write out the correlations to a StreamWriter. | |
Protected Member Functions | |
override float | ComputeCorrelationFromOverlap (float overlap, float count_x, float count_y) |
Protected Attributes | |
internal List< List< int > > | index_list = new List<List<int>>() |
List of lists that stores the column indices of the entries. | |
internal List< List< T > > | value_list = new List<List<T>>() |
List of lists that stores the values of the entries. | |
Properties | |
override bool | IsSymmetric [get] |
returns true if the matrix is symmetric, which is generally the case for similarity matrices | |
override IList< Tuple< int, int > > | NonEmptyEntryIDs [get] |
The row and column IDs of non-empty entries in the matrix. | |
int | NumberOfColumns [get, set] |
The number of columns of the matrix. | |
override int | NumberOfNonEmptyEntries [get] |
The number of non-empty entries in the matrix. | |
int | NumberOfRows [get] |
The number of rows of the matrix. | |
int | NumEntities [get, set] |
size of the matrix (number of entities) | |
override T | this[int x, int y] [get, set] |
Access the elements of the sparse matrix. | |
Dictionary< int, T > | this[int x] [get] |
Get a row of the matrix. | |
bool | Weighted [get, set] |
If set to true, give a lower weight to evidence coming from very frequent entities. |
Class for storing and computing the co-counts.
Cooccurrence | ( | int | num_entities | ) | [inline] |
Creates an object of type Cooccurrence.
num_entities | the number of entities |
void AddEntity | ( | int | entity_id | ) | [inline, inherited] |
Add an entity to the ICorrelationMatrix by growing it to the requested size.
Note that you still have to correctly compute and set the entity's correlation values
entity_id | the numerical ID of the entity |
Implements ICorrelationMatrix.
float ComputeCorrelation | ( | ICollection< int > | vector_i, |
ICollection< int > | vector_j | ||
) | [inline, inherited] |
Computes the correlation of two binary vectors.
vector_i | the first vector |
vector_j | the second vector |
Implements IBinaryDataCorrelationMatrix.
void ComputeCorrelations | ( | IBooleanMatrix | entity_data | ) | [inline, inherited] |
Compute the correlations from an implicit feedback, positive-only dataset.
entity_data | the implicit feedback set, rows contain the entities to correlate |
Implements IBinaryDataCorrelationMatrix.
override IMatrix<T> CreateMatrix | ( | int | num_rows, |
int | num_columns | ||
) | [inline, virtual, inherited] |
Create a matrix with a given number of rows and columns.
num_rows | the number of rows |
num_columns | the number of columns |
Reimplemented from SparseMatrix< T >.
Reimplemented in SkewSymmetricSparseMatrix.
override void Resize | ( | int | size | ) | [inline, inherited] |
void Resize | ( | int | num_rows, |
int | num_cols | ||
) | [inline, inherited] |
Grows or shrinks the matrix to the requested size, if necessary.
The new entries are filled with zeros. Obsolete entries are removed.
num_rows | the number of rows |
num_cols | the number of columns |
Implements IMatrix< T >.
SparseMatrix | ( | int | num_rows, |
int | num_cols | ||
) | [inline, inherited] |
Create a sparse matrix with a given number of rows.
num_rows | the number of rows |
num_cols | the number of columns |
SymmetricSparseMatrix | ( | int | dimension | ) | [inline, inherited] |
Create a symmetric sparse matrix with a given dimension.
dimension | the dimension (number of rows/columns) |
virtual IMatrix<T> Transpose | ( | ) | [inline, virtual, inherited] |
Get the transpose of the matrix, i.e. a matrix where rows and columns are interchanged.
Implements IMatrix< T >.
void Write | ( | StreamWriter | writer | ) | [inline, inherited] |
Write out the correlations to a StreamWriter.
writer | A StreamWriter |
Implements ICorrelationMatrix.
internal List<List<int> > index_list = new List<List<int>>() [protected, inherited] |
List of lists that stores the column indices of the entries.
internal List<List<T> > value_list = new List<List<T>>() [protected, inherited] |
List of lists that stores the values of the entries.
override IList<Tuple<int, int> > NonEmptyEntryIDs [get, inherited] |
The row and column IDs of non-empty entries in the matrix.
The row and column IDs of non-empty entries in the matrix
Reimplemented from SparseMatrix< T >.
int NumberOfColumns [get, set, inherited] |
override int NumberOfNonEmptyEntries [get, inherited] |
The number of non-empty entries in the matrix.
The number of non-empty entries in the matrix
Reimplemented from SparseMatrix< T >.
int NumberOfRows [get, inherited] |
int NumEntities [get, set, inherited] |
size of the matrix (number of entities)
Implements ICorrelationMatrix.
override T this[int x, int y] [get, set, inherited] |
Access the elements of the sparse matrix.
x | the row ID |
y | the column ID |
Reimplemented from SparseMatrix< T >.
Reimplemented in SkewSymmetricSparseMatrix.
Dictionary<int, T> this[int x] [get, inherited] |
Get a row of the matrix.
x | the row ID |
bool Weighted [get, set, inherited] |
If set to true, give a lower weight to evidence coming from very frequent entities.
Implements IBinaryDataCorrelationMatrix.