Class RecommenderEvaluatorMappingExtensions

Extensions methods for the IRecommenderEvaluatorMapping<TInstanceSource, TUser, TItem, TRating> interface.

Inheritance

Object

RecommenderEvaluatorMappingExtensions

Inherited Members

Object.Equals(Object)

Object.Equals(Object, Object)

Object.GetHashCode()

Object.GetType()

Object.MemberwiseClone()

Object.ReferenceEquals(Object, Object)

Object.ToString()

Namespace: Microsoft.ML.Probabilistic.Learners.Mappings

Assembly: Microsoft.ML.Probabilistic.Learners.Recommender.dll

Syntax

public static class RecommenderEvaluatorMappingExtensions

Methods

GetItemsRatedBySameUsers<TInstanceSource, TUser, TItem, TRating>(IRecommenderEvaluatorMapping<TInstanceSource, TUser, TItem, TRating>, TInstanceSource, TItem)

Finds all the items which have been rated by the same user as queryItem.

Declaration

public static Dictionary<TItem, List<TUser>> GetItemsRatedBySameUsers<TInstanceSource, TUser, TItem, TRating>(this IRecommenderEvaluatorMapping<TInstanceSource, TUser, TItem, TRating> mapping, TInstanceSource instanceSource, TItem queryItem)

Parameters

Type	Name	Description
IRecommenderEvaluatorMapping<TInstanceSource, TUser, TItem, TRating>	mapping	The mapping.
TInstanceSource	instanceSource	The instance source with items.
TItem	queryItem	The query item.

Returns

Type	Description
Dictionary<TItem, List<TUser>>	A dictionary which maps items from the instanceSource to the lists of users who has rated both the item and queryItem. Only items with at least one such user are returned.

Type Parameters

Name	Description
TInstanceSource	The type of a source of instances.
TUser	The type of a user.
TItem	The type of an item.
TRating	The type of a rating.

GetUsersWhoRatedSameItems<TInstanceSource, TUser, TItem, TRating>(IRecommenderEvaluatorMapping<TInstanceSource, TUser, TItem, TRating>, TInstanceSource, TUser)

Finds all the users who have rated the same item as queryUser.

Declaration

public static Dictionary<TUser, List<TItem>> GetUsersWhoRatedSameItems<TInstanceSource, TUser, TItem, TRating>(this IRecommenderEvaluatorMapping<TInstanceSource, TUser, TItem, TRating> mapping, TInstanceSource instanceSource, TUser queryUser)

Parameters

Type	Name	Description
IRecommenderEvaluatorMapping<TInstanceSource, TUser, TItem, TRating>	mapping	The mapping.
TInstanceSource	instanceSource	The instance source with items.
TUser	queryUser	The query user.

Returns

Type	Description
Dictionary<TUser, List<TItem>>	A dictionary which maps users from the instanceSource to the lists of items which have been rated by both the user and queryUser. Only users with at least one such item are returned.

Type Parameters

Name	Description
TInstanceSource	The type of a source of instances.
TUser	The type of a user.
TItem	The type of an item.
TRating	The type of a rating.