MyMediaLite
3.11
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Interface for different kinds of collaborative filtering data sets More...
Public Member Functions | |
int | GetIndex (int user_id, int item_id) |
Get index for a given user and item More... | |
int | GetIndex (int user_id, int item_id, ICollection< int > indexes) |
Get index for given user and item More... | |
ISet< int > | GetItems (IList< int > indices) |
Get all items that are referenced by a given list of indices More... | |
ISet< int > | GetUsers (IList< int > indices) |
Get all users that are referenced by a given list of indices More... | |
void | RemoveItem (int item_id) |
Remove all events related to a given item More... | |
void | RemoveUser (int user_id) |
Remove all events related to a given user More... | |
bool | TryGetIndex (int user_id, int item_id, out int index) |
Try to get the index for given user and item More... | |
bool | TryGetIndex (int user_id, int item_id, ICollection< int > indexes, out int index) |
Try to get the index for given user and item More... | |
Properties | |
IList< int > | AllItems [get] |
all item IDs in the dataset More... | |
IList< int > | AllUsers [get] |
all user IDs in the dataset More... | |
IList< IList< int > > | ByItem [get] |
indices by item More... | |
IList< IList< int > > | ByUser [get] |
indices by user More... | |
int | Count [get] |
the number of interaction events in the dataset More... | |
IList< int > | CountByItem [get] |
count by item More... | |
IList< int > | CountByUser [get] |
count by user More... | |
IList< int > | Items [get] |
the item entries More... | |
int | MaxItemID [get] |
the maximum item ID in the dataset More... | |
int | MaxUserID [get] |
the maximum user ID in the dataset More... | |
IList< int > | RandomIndex [get] |
get a randomly ordered list of all indices More... | |
IList< int > | Users [get] |
the user entries More... | |
Interface for different kinds of collaborative filtering data sets
Implementing classes/inheriting interfaces are e.g. for rating data and for positive-only implicit feedback.
The main feature of a dataset is that it has some kind of order (not explicitly stated)
Implementing classes and inheriting interfaces can add additional data to each user-item tuple, e.g. the date/time of an event, location, context, etc., as well as additional index structures to access the dataset in a certain fashion.
int GetIndex | ( | int | user_id, |
int | item_id | ||
) |
Get index for a given user and item
user_id | the user ID |
item_id | the item ID |
Implemented in DataSet.
int GetIndex | ( | int | user_id, |
int | item_id, | ||
ICollection< int > | indexes | ||
) |
Get index for given user and item
user_id | the user ID |
item_id | the item ID |
indexes | the indexes to look at |
Implemented in DataSet.
ISet<int> GetItems | ( | IList< int > | indices | ) |
Get all items that are referenced by a given list of indices
indices | the indices to take into account |
Implemented in DataSet.
ISet<int> GetUsers | ( | IList< int > | indices | ) |
Get all users that are referenced by a given list of indices
indices | the indices to take into account |
Implemented in DataSet.
void RemoveItem | ( | int | item_id | ) |
Remove all events related to a given item
item_id | the item ID |
Implemented in Ratings, DataSet, PosOnlyFeedback< T >, StaticRatings, and RatingsProxy.
void RemoveUser | ( | int | user_id | ) |
Remove all events related to a given user
user_id | the user ID |
Implemented in Ratings, DataSet, PosOnlyFeedback< T >, StaticRatings, and RatingsProxy.
bool TryGetIndex | ( | int | user_id, |
int | item_id, | ||
out int | index | ||
) |
Try to get the index for given user and item
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 |
Implemented in DataSet.
bool TryGetIndex | ( | int | user_id, |
int | item_id, | ||
ICollection< int > | indexes, | ||
out int | index | ||
) |
Try to get the index for given user and item
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 |
Implemented in DataSet.
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get |
all item IDs in the dataset
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get |
all user IDs in the dataset
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get |
indices by item
Should be implemented as a lazy data structure
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get |
indices by user
Should be implemented as a lazy data structure
|
get |
the number of interaction events in the dataset
|
get |
count by item
Should be implemented as a lazy data structure
|
get |
count by user
Should be implemented as a lazy data structure
|
get |
the item entries
|
get |
the maximum item ID in the dataset
|
get |
the maximum user ID in the dataset
|
get |
get a randomly ordered list of all indices
Should be implemented as a lazy data structure
|
get |
the user entries