public class TF_IDF extends WeightingModel
averageDocumentLength, c, cs, documentFrequency, es, i, keyFrequency, numberOfDocuments, numberOfPointers, numberOfTokens, numberOfUniqueTerms, rq, termFrequency
Constructor and Description |
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TF_IDF()
A default constructor to make this model.
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TF_IDF(double _b)
Constructs an instance of TF_IDF
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Modifier and Type | Method and Description |
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String |
getInfo()
Returns the name of the model, in this case "TF_IDF"
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double |
getParameter()
Returns the b parameter to the ranking formula as set by setParameter()
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double |
score(double tf,
double docLength)
Uses TF_IDF to compute a weight for a term in a document.
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double |
score(double tf,
double docLength,
double documentFrequency,
double termFrequency,
double keyFrequency)
Deprecated.
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void |
setParameter(double _b)
Sets the b parameter to ranking formula
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clone, getOverflowed, prepare, score, setCollectionStatistics, setEntryStatistics, setKeyFrequency, setRequest
public TF_IDF()
public TF_IDF(double _b)
_b
- public final 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 of the term in the documentdocLength
- the document's length@Deprecated public final double score(double tf, double docLength, double documentFrequency, double termFrequency, double keyFrequency)
score
in class WeightingModel
tf
- The term frequency in the documentdocLength
- the document's lengthdocumentFrequency
- The document frequency of the termtermFrequency
- the term frequency in the collectionkeyFrequency
- the term frequency in the querypublic void setParameter(double _b)
setParameter
in interface Model
setParameter
in class WeightingModel
_b
- the b parameter value to use.public double getParameter()
getParameter
in interface Model
getParameter
in class WeightingModel
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