MyMediaLite
3.11
|
CorrelationMatrix that computes correlations over rating data More...
Public Member Functions | |
void | AddEntity (int entity_id) |
Add an entity to the ICorrelationMatrix by growing it to the requested size. More... | |
float | ComputeCorrelation (IRatings ratings, EntityType entity_type, int i, int j) |
Computes the correlation of two rating vectors More... | |
float | ComputeCorrelation (IRatings ratings, EntityType entity_type, IList< Tuple< int, float >> entity_ratings, int j) |
Compute correlation between two entities for given ratings More... | |
void | ComputeCorrelations (IRatings ratings, EntityType entity_type) |
Compute the correlations for a given entity type from a rating dataset More... | |
IMatrix< T > | CreateMatrix (int num_rows, int num_columns) |
Create a matrix with a given number of rows and columns More... | |
void | Resize (int size) |
Resize to the given size More... | |
void | Resize (int num_rows, int num_cols) |
Grows or shrinks the matrix to the requested size, if necessary More... | |
IMatrix< T > | Transpose () |
Get the transpose of the matrix, i.e. a matrix where rows and columns are interchanged More... | |
void | Write (StreamWriter writer) |
Write out the correlations to a StreamWriter More... | |
Properties | |
bool | IsSymmetric [get] |
True if the matrix is stored in a symmetric manner, false otherwise More... | |
int | NumberOfColumns [get] |
The number of columns of the matrix More... | |
int | NumberOfRows [get] |
The number of rows of the matrix More... | |
int | NumEntities [get] |
size of the matrix (number of entities) More... | |
T | this[int x, int y] [get, set] |
The value at (i,j) More... | |
CorrelationMatrix that computes correlations over rating data
|
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 |
Implemented in SymmetricCorrelationMatrix, and AsymmetricCorrelationMatrix.
float ComputeCorrelation | ( | IRatings | ratings, |
EntityType | entity_type, | ||
int | i, | ||
int | j | ||
) |
Computes the correlation of two rating vectors
ratings | the rating data |
entity_type | the entity type, either USER or ITEM |
i | the ID of the first entity |
j | the ID of the second entity |
Implemented in Pearson.
float ComputeCorrelation | ( | IRatings | ratings, |
EntityType | entity_type, | ||
IList< Tuple< int, float >> | entity_ratings, | ||
int | j | ||
) |
Compute correlation between two entities for given ratings
ratings | the rating data |
entity_type | the entity type, either USER or ITEM |
entity_ratings | ratings identifying the first entity |
j | the ID of second entity |
Implemented in Pearson.
void ComputeCorrelations | ( | IRatings | ratings, |
EntityType | entity_type | ||
) |
Compute the correlations for a given entity type from a rating dataset
ratings | the rating data |
entity_type | the EntityType - either USER or ITEM |
Implemented in Pearson.
|
inherited |
Create a matrix with a given number of rows and columns
num_rows | the number of rows |
num_columns | the number of columns |
|
inherited |
Resize to the given size
size | the size |
Implemented in AsymmetricCorrelationMatrix, and SymmetricCorrelationMatrix.
|
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 |
|
inherited |
Get the transpose of the matrix, i.e. a matrix where rows and columns are interchanged
|
inherited |
Write out the correlations to a StreamWriter
writer | A StreamWriter |
Implemented in AsymmetricCorrelationMatrix, and SymmetricCorrelationMatrix.
|
getinherited |
True if the matrix is stored in a symmetric manner, false otherwise
Also true for skew symmetric matrices that exploit this property in order to save memory
|
getinherited |
The number of columns of the matrix
The number of columns of the matrix
|
getinherited |
The number of rows of the matrix
The number of rows of the matrix
|
getinherited |
size of the matrix (number of entities)
|
getsetinherited |
The value at (i,j)
The value at (i,j)
x | the row ID |
y | the column ID |