Data structure for implicit, positive-only user feedback More...

Inheritance diagram for PosOnlyFeedback< T >:

Public Member Functions
void	Add (int user_id, int item_id)
	Add a user-item event to the data structure
int	GetIndex (int user_id, int item_id)
	Get index for a given user and item
int	GetIndex (int user_id, int item_id, ICollection< int > indexes)
	Get index for given user and item
IBooleanMatrix	GetItemMatrixCopy ()
	Get a copy of the item matrix
ISet< int >	GetItems (IList< int > indices)
	Get all items that are referenced by a given list of indices
virtual void	GetObjectData (SerializationInfo info, StreamingContext context)
IBooleanMatrix	GetUserMatrixCopy ()
	Get a copy of the user matrix
ISet< int >	GetUsers (IList< int > indices)
	Get all users that are referenced by a given list of indices
	PosOnlyFeedback ()
	Default constructor
	PosOnlyFeedback (IDataSet dataset)
	PosOnlyFeedback (SerializationInfo info, StreamingContext context)
void	Remove (int user_id, int item_id)
	Remove a user-item event from the data structure
void	Remove (int index)
	Remove the event with a given index
override void	RemoveItem (int item_id)
	Remove all feedback about a given item
override void	RemoveUser (int user_id)
	Remove all feedback by a given user
IPosOnlyFeedback	Transpose ()
	Get the transpose of the dataset (users and items exchanged)
bool	TryGetIndex (int user_id, int item_id, out int index)
	Try to get the index for given user and item
bool	TryGetIndex (int user_id, int item_id, ICollection< int > indexes, out int index)
	Try to get the index for given user and item

Protected Attributes
IList< IList< int > >	by_item
	Indices organized by item
IList< IList< int > >	by_user
	Indices organized by user
IList< int >	count_by_item
	field for storing the count per item
IList< int >	count_by_user
	field for storing the count per user

Properties
IList< int >	AllItems `[get]`
IList< int >	AllUsers `[get]`
IList< IList< int > >	ByItem `[get]`
IList< IList< int > >	ByUser `[get]`
virtual int	Count `[get]`
IList< int >	CountByItem `[get]`
IList< int >	CountByUser `[get]`
IBooleanMatrix	ItemMatrix `[get]`
	By-item access, items are stored in the rows, users in the columns
IList< int >	Items `[get, set]`
int	MaxItemID `[get, set]`
int	MaxUserID `[get, set]`
IList< int >	RandomIndex `[get]`
IBooleanMatrix	UserMatrix `[get]`
	By-user access, users are stored in the rows, items in the columns
IList< int >	Users `[get, set]`

Detailed Description

Data structure for implicit, positive-only user feedback

This data structure supports incremental updates if supported by the type parameter T.

Type Constraints

T	:	IBooleanMatrix
T	:	new()

Member Function Documentation

void Add	(	int	user_id,
		int	item_id
	)

inline

Add a user-item event to the data structure

Parameters

user_id	the user ID
item_id	the item ID

Implements IPosOnlyFeedback.

int GetIndex	(	int	user_id,
		int	item_id
	)

inlineinherited

Get index for a given user and item

Parameters

user_id	the user ID
item_id	the item ID

Returns: the index of the first event encountered that matches the user ID and item ID

Implements IDataSet.

int GetIndex	(	int	user_id,
		int	item_id,
		ICollection< int >	indexes
	)

inlineinherited

Get index for given user and item

Parameters

user_id	the user ID
item_id	the item ID
indexes	the indexes to look at

Returns: the index of the first event encountered that matches the user ID and item ID

Implements IDataSet.

IBooleanMatrix GetItemMatrixCopy ( )

inline

Get a copy of the item matrix

Returns: a copy of the item matrix

Implements IPosOnlyFeedback.

ISet<int> GetItems ( IList< int > indices )

inlineinherited

Get all items that are referenced by a given list of indices

Parameters

indices the indices to take into account

Returns: all items referenced by the list of indices

Implements IDataSet.

IBooleanMatrix GetUserMatrixCopy ( )

inline

Get a copy of the user matrix

Returns: a copy of the user matrix

Implements IPosOnlyFeedback.

ISet<int> GetUsers ( IList< int > indices )

inlineinherited

Get all users that are referenced by a given list of indices

Parameters

indices the indices to take into account

Returns: all users referenced by the list of indices

Implements IDataSet.

PosOnlyFeedback ( )

inline

Default constructor

void Remove	(	int	user_id,
		int	item_id
	)

inline

Remove a user-item event from the data structure

If no event for the given user-item combination exists, nothing happens.

Parameters

user_id	the user ID
item_id	the item ID

Implements IPosOnlyFeedback.

void Remove ( int index )

inline

Remove the event with a given index

Parameters

index the index of the event to be removed

override void RemoveItem ( int item_id )

inlinevirtual

Remove all feedback about a given item

Parameters

item_id the item ID

Implements DataSet.

override void RemoveUser ( int user_id )

inlinevirtual

Remove all feedback by a given user

Parameters

user_id the user id

Implements DataSet.

IPosOnlyFeedback Transpose ( )

inline

Get the transpose of the dataset (users and items exchanged)

Returns: the transpose of the dataset

Implements IPosOnlyFeedback.

bool TryGetIndex	(	int	user_id,
		int	item_id,
		out int	index
	)

inlineinherited

Try to get the index for given user and item

Parameters

user_id	the user ID
item_id	the item ID
index	will contain the index of the first event encountered that matches the user ID and item ID

Returns: true if an index was found for the user and item

Implements IDataSet.

bool TryGetIndex	(	int	user_id,
		int	item_id,
		ICollection< int >	indexes,
		out int	index
	)

inlineinherited

Try to get the index for given user and item

Parameters

user_id	the user ID
item_id	the item ID
indexes	the indexes to look at
index	will contain the index of the first event encountered that matches the user ID and item ID

Returns: true if an index was found for the user and item

Implements IDataSet.

Member Data Documentation

IList<IList<int> > by_item

protectedinherited

Indices organized by item

IList<IList<int> > by_user

protectedinherited

Indices organized by user

IList<int> count_by_item

protectedinherited

field for storing the count per item

IList<int> count_by_user

protectedinherited

field for storing the count per user

Property Documentation

IBooleanMatrix ItemMatrix

get

By-item access, items are stored in the rows, users in the columns

IBooleanMatrix UserMatrix

get

By-user access, users are stored in the rows, items in the columns

The documentation for this class was generated from the following file:

PosOnlyFeedback.cs

Public Member Functions

Protected Attributes

Properties

Detailed Description

Member Function Documentation

Member Data Documentation

Property Documentation