PlusAnonymousUserDataModel Class

NReco.Recommender Class Library

This IDataModel decorator class is useful in a situation where you wish to recommend to a user that doesn't really exist yet in your actual IDataModel. For example maybe you wish to recommend DVDs to a user who has browsed a few titles on your DVD store site, but, the user is not yet registered.

This enables you to temporarily add a temporary user to an existing IDataModel in a way that recommenders can then produce recommendations anyway.

Inheritance Hierarchy

System Object
NReco.CF.Taste.Impl.Model PlusAnonymousUserDataModel
NReco.CF.Taste.Impl.Model PlusAnonymousConcurrentUserDataModel

Namespace: NReco.CF.Taste.Impl.Model
Assembly: NReco.Recommender (in NReco.Recommender.dll) Version: 1.0.0.0 (1.0.0.0)

Syntax

C++

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public class PlusAnonymousUserDataModel : IDataModel, 
	IRefreshable

public class PlusAnonymousUserDataModel : IDataModel, 
	IRefreshable

Public Class PlusAnonymousUserDataModel 
	Implements IDataModel, IRefreshable

Public Class PlusAnonymousUserDataModel 
	Implements IDataModel, IRefreshable

public ref class PlusAnonymousUserDataModel : IDataModel, 
	IRefreshable

public ref class PlusAnonymousUserDataModel : IDataModel, 
	IRefreshable

type PlusAnonymousUserDataModel =  
    class 
        interface IDataModel 
        interface IRefreshable 
    end

type PlusAnonymousUserDataModel =  
    class 
        interface IDataModel 
        interface IRefreshable 
    end

The PlusAnonymousUserDataModel type exposes the following members.

Constructors

	Name	Description
	PlusAnonymousUserDataModel	Initializes a new instance of the PlusAnonymousUserDataModel class

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Methods

	Name	Description
	clearTempPrefs
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	getDelegate
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetItemIDs
	GetItemIDsFromUser
	GetMaxPreference
	GetMinPreference
	GetNumItems
	GetNumUsers
	GetNumUsersWithPreferenceFor(Int64)
	GetNumUsersWithPreferenceFor(Int64, Int64)
	GetPreferencesForItem
	GetPreferencesFromUser
	GetPreferenceTime
	GetPreferenceValue
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetUserIDs
	HasPreferenceValues
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	Refresh
	RemovePreference
	SetPreference
	SetTempPrefs
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Fields

	Name	Description
	TEMP_USER_ID

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Examples

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IDataModel realModel = ...;
IDataModel plusModel = new PlusAnonymousUserDataModel(realModel);
...
var similarity = new LogLikelihoodSimilarity(realModel); // not plusModel

IDataModel realModel = ...;
IDataModel plusModel = new PlusAnonymousUserDataModel(realModel);
...
var similarity = new LogLikelihoodSimilarity(realModel); // not plusModel

But, you may continue to use

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realModel

realModel

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lock

lock

as input to other components. To recommend, first construct and set the temporary user information on the model and then simply call the recommender. The block exists to remind you that this is of course not thread-safe. Only one set of temp data can be inserted into the model and used at one time.

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IRecommender recommender = ...;
...
lock(...) {
  IPreferenceArray tempPrefs = ...;
  plusModel.SetTempPrefs(tempPrefs);
  recommender.Recommend(PlusAnonymousUserDataModel.TEMP_USER_ID, 10);
  plusModel.SetTempPrefs(null);
}

IRecommender recommender = ...;
...
lock(...) {
  IPreferenceArray tempPrefs = ...;
  plusModel.SetTempPrefs(tempPrefs);
  recommender.Recommend(PlusAnonymousUserDataModel.TEMP_USER_ID, 10);
  plusModel.SetTempPrefs(null);
}