C# Class MyMediaLite.RatingPrediction.ItemKNN

Weighted item-based kNN

Inheritance: KNN, IItemSimilarityProvider, IFoldInRatingPredictor

ファイルを表示 Open project: zenogantner/MML-KDD

Protected Properties

Property	Type	Description
GetPositivelyCorrelatedEntities	IList>.Func
data_item	MyMediaLite.DataType.SparseBooleanMatrix

Public Methods

Method	Description
AddRating ( int user_id, int item_id, double rating ) : void
ItemKNN ( ) : System
LoadModel ( string filename ) : void
Predict ( int user_id, int item_id ) : double	Predict the rating of a given user for a given item If the user or the item are not known to the recommender, a suitable average is returned. To avoid this behavior for unknown entities, use CanPredict() to check before.
RemoveRating ( int user_id, int item_id ) : void
UpdateRating ( int user_id, int item_id, double rating ) : void

Protected Methods

Method	Description
AddItem ( int item_id ) : void

Method Details

AddItem() protected method

protected AddItem ( int item_id ) : void
item_id	int
return	void

AddRating() public method

public AddRating ( int user_id, int item_id, double rating ) : void
user_id	int
item_id	int
rating	double
return	void

ItemKNN() public method

public ItemKNN ( ) : System
return	System

LoadModel() public method

public LoadModel ( string filename ) : void
filename	string
return	void

Predict() public method

Predict the rating of a given user for a given item

If the user or the item are not known to the recommender, a suitable average is returned. To avoid this behavior for unknown entities, use CanPredict() to check before.

public Predict ( int user_id, int item_id ) : double
user_id	int	the user ID
item_id	int	the item ID
return	double

RemoveRating() public method

public RemoveRating ( int user_id, int item_id ) : void
user_id	int
item_id	int
return	void

UpdateRating() public method

public UpdateRating ( int user_id, int item_id, double rating ) : void
user_id	int
item_id	int
rating	double
return	void

Property Details

GetPositivelyCorrelatedEntities protected_oe property

Get positively correlated entities

protected Func> GetPositivelyCorrelatedEntities
return	IList>.Func

data_item protected_oe property

Matrix indicating which item was rated by which user

protected SparseBooleanMatrix,MyMediaLite.DataType data_item
return	MyMediaLite.DataType.SparseBooleanMatrix