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java.lang.Objectorg.mymedialite.ratingprediction.RatingPredictor
org.mymedialite.ratingprediction.IncrementalRatingPredictor
org.mymedialite.ratingprediction.Constant
public class Constant
Uses a constant rating value for prediction. This recommender supports incremental updates. Updates are just ignored, because the prediction is always the same.
Field Summary | |
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double |
constantRating
the constant rating. |
Fields inherited from class org.mymedialite.ratingprediction.IncrementalRatingPredictor |
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updateItems, updateUsers |
Fields inherited from class org.mymedialite.ratingprediction.RatingPredictor |
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maxItemID, maxRating, maxUserID, minRating, ratings |
Constructor Summary | |
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Constant()
Default constructor. |
Method Summary | |
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boolean |
canPredict(int user_id,
int item_id)
Check whether a useful prediction can be made for a given user-item combination. |
void |
loadModel(java.lang.String filename)
Get the model parameters from a file |
double |
predict(int user_id,
int item_id)
Predict the rating or score for a given user-item combination. |
void |
saveModel(java.lang.String filename)
Save the model parameters to a file |
java.lang.String |
toString()
Return a string representation of the recommender |
void |
train()
Learn the model parameters of the recommender from the training data |
Methods inherited from class org.mymedialite.ratingprediction.IncrementalRatingPredictor |
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addItem, addRating, addUser, getUpdateItems, getUpdateUsers, removeItem, removeRating, removeUser, setUpdateItems, setUpdateUsers, updateRating |
Methods inherited from class org.mymedialite.ratingprediction.RatingPredictor |
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clone, getMaxRating, getMinRating, getRatings, setMaxRating, setMinRating, setRatings |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.mymedialite.ratingprediction.IRatingPredictor |
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getMaxRating, getMinRating, setMaxRating, setMinRating |
Field Detail |
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public double constantRating
Constructor Detail |
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public Constant()
Method Detail |
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public void train()
IRecommender
train
in interface IRecommender
train
in class RatingPredictor
public boolean canPredict(int user_id, int item_id)
IRecommender
canPredict
in interface IRecommender
canPredict
in class RatingPredictor
user_id
- the user IDitem_id
- the item ID
public double predict(int user_id, int item_id)
IRecommender
predict
in interface IRecommender
predict
in class RatingPredictor
user_id
- the user IDitem_id
- the item ID
public void saveModel(java.lang.String filename)
IRecommender
saveModel
in interface IRecommender
saveModel
in class RatingPredictor
filename
- the file to write topublic void loadModel(java.lang.String filename)
IRecommender
loadModel
in interface IRecommender
loadModel
in class RatingPredictor
filename
- the file to read frompublic java.lang.String toString()
IRecommender
toString
in interface IRecommender
toString
in class RatingPredictor
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