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java.lang.Object org.terrier.matching.models.aftereffect.AfterEffect org.terrier.matching.models.aftereffect.LL
public class LL
This class implements the LL model for the first normalisation by after effect. LL stands for the log of laplace succession.
Field Summary | |
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protected java.lang.String |
methodName
The name of the model. |
Fields inherited from class org.terrier.matching.models.aftereffect.AfterEffect |
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avl, parameter |
Constructor Summary | |
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LL()
The default constructor. |
Method Summary | |
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double |
gain(double tf,
double documentFrequency,
double termFrequency)
This method computes the gain of encountering an extra token of the query term. |
java.lang.String |
getInfo()
Returns the name of the method. |
Methods inherited from class org.terrier.matching.models.aftereffect.AfterEffect |
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getParameter, setAverageDocumentLength, setParameter |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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protected final java.lang.String methodName
Constructor Detail |
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public LL()
Method Detail |
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public java.lang.String getInfo()
getInfo
in class AfterEffect
public double gain(double tf, double documentFrequency, double termFrequency)
gain
in class AfterEffect
tf
- The term frequency in the documentdocumentFrequency
- The document frequency of the termtermFrequency
- the term frequency in the collection
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