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java.lang.Object org.terrier.matching.models.WeightingModel org.terrier.matching.models.DLH13
public class DLH13
This class implements the DLH13 weighting model. This is a parameter-free weighting model. Even if the user specifies a parameter value, it will NOT affect the results. It is highly recomended to use the model with query expansion.
References
Field Summary |
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Fields inherited from class org.terrier.matching.models.WeightingModel |
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averageDocumentLength, c, documentFrequency, i, keyFrequency, numberOfDocuments, numberOfPointers, numberOfTokens, numberOfUniqueTerms, termFrequency |
Constructor Summary | |
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DLH13()
A default constructor. |
Method Summary | |
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java.lang.String |
getInfo()
Returns the name of the model. |
double |
score(double tf,
double docLength)
Uses DLH13 to compute a weight for a term in a document. |
double |
score(double tf,
double docLength,
double n_t,
double F_t,
double keyFrequency)
Uses DLH13 to compute a weight for a term in a document. |
Methods inherited from class org.terrier.matching.models.WeightingModel |
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clone, getOverflowed, getParameter, prepare, score, setAverageDocumentLength, setCollectionStatistics, setDocumentFrequency, setEntryStatistics, setKeyFrequency, setNumberOfDocuments, setNumberOfPointers, setNumberOfTokens, setNumberOfUniqueTerms, setParameter, setRequest, setTermFrequency, stirlingPower |
Methods inherited from class java.lang.Object |
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equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public DLH13()
Method Detail |
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public final java.lang.String getInfo()
getInfo
in interface Model
getInfo
in class WeightingModel
public final double score(double tf, double docLength)
score
in class WeightingModel
tf
- The term frequency in the documentdocLength
- the document's length
public final double score(double tf, double docLength, double n_t, double F_t, double keyFrequency)
score
in class WeightingModel
tf
- The term frequency in the documentdocLength
- the document's lengthn_t
- The document frequency of the termF_t
- the term frequency in the collectionkeyFrequency
- the term frequency in the query
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