#include <TextQueryRetMethod.hpp>
Inheritance diagram for TextQueryRetMethod:
Public Methods | |
| TextQueryRetMethod (const Index &ind, ScoreAccumulator &accumulator) | |
| virtual | ~TextQueryRetMethod () |
| virtual TextQueryRep * | computeTextQueryRep (const TermQuery &qry)=0 |
| compute the query representation for a text query (caller responsible for deleting the memory of the generated new instance) | |
| virtual TextQueryRep * | computeTextQueryRep (int docid) |
| compute a query rep for an existing doc (DOCID_T needed). | |
| virtual QueryRep * | computeQueryRep (const Query &qry) |
| overriding abstract class method | |
| virtual double | scoreDoc (const QueryRep &qry, int docID) |
| ooverriding abstract class method | |
| virtual void | scoreCollection (const QueryRep &qry, IndexedRealVector &results) |
| overriding abstract class method with a general efficient inverted index scoring procedure | |
| virtual void | scoreCollection (int docid, IndexedRealVector &results) |
| add support for scoring an existing document against the collection | |
| virtual DocumentRep * | computeDocRep (int docID)=0 |
| compute the doc representation (caller responsible for deleting the memory of the generated new instance) | |
| virtual ScoreFunction * | scoreFunc ()=0 |
| return the scoring function pointer | |
| virtual void | updateQuery (QueryRep &qryRep, const DocIDSet &relDocs) |
| update the query | |
| virtual void | updateTextQuery (TextQueryRep &qryRep, const DocIDSet &relDocs)=0 |
| Modify/update the query representation based on a set (presumably) relevant documents. | |
| virtual void | scoreInvertedIndex (const QueryRep &qryRep, IndexedRealVector &scores, bool scoreAll=false) |
| Efficient scoring with the inverted index. | |
| virtual double | scoreDocVector (const TextQueryRep &qry, int docID, FreqVector &docVector) |
| virtual double | scoreDocPassages (const TermQuery &qRep, int docID, PassageScoreVector &scores, int psgSize, int overlap) |
| Score a query for each passage of a document. | |
Protected Attributes | |
| ScoreAccumulator & | scAcc |
| DocumentRep ** | docReps |
| cache document reps. | |
| bool | cacheDocReps |
| whether or not to cache document representations | |
| int | docRepsSize |
| number of documents plus 1, the size of the docReps array. | |
q =(q1,q2,...,qN) and a document d=(d1,d2,...,dN), where q1,...,qN and d1,...,dN are terms, TextQueryRetMethod assumes the following general scoring function:
s(q,d) = g(w(q1,d1,q,d) + ... + w(qN,dN,q,d),q,d)That is, the score of a document
d against a query q is a function g of the accumulated weight w for each matched term.
The score is thus determined by two functions g and w; both may depend on the whole query or document. The function w gives the weight of each matched term, while the function g makes it possible to perform any further transformation of the sum of the weight of all matched terms based on the "summary" information of a query or a document (e.g., document length).
TextQueryRep, DocumentRep, and ScoreFunction are designed to support this general scoring function in the following way:
A ScoreFunction is responsible for defining the two functions g and w. A TextQueryRep provides any information required for scoring from the query side (e.g., query term frequency). Similarly, a DocumentRep provides any information required for scoring from the document side. Furthermore, a TextQueryRep supports iteration over all query terms, allowing easy accumulation of weights over matched terms. The weighting function w and score adjustment function g typically assume and depend on some particular information and representation of the query and document, so a specific ScoreFunction (for a specific retrieval method) only works for some specific TextQueryRep and DocumentRep that are appropriate for the specific retrieval method.
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Create the retrieval method. If cacheDocReps is true, allocate DocumentRep cache array. |
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Destroy the object. If cacheDocReps is true, delete the DocumentRep cache array |
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compute the doc representation (caller responsible for deleting the memory of the generated new instance)
Implemented in CORIRetMethod, CosSimRetMethod, OkapiRetMethod, SimpleKLRetMethod, and TFIDFRetMethod. |
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overriding abstract class method
Implements RetrievalMethod. |
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compute a query rep for an existing doc (DOCID_T needed).
Reimplemented in CosSimRetMethod. |
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compute the query representation for a text query (caller responsible for deleting the memory of the generated new instance)
Implemented in CORIRetMethod, CosSimRetMethod, OkapiRetMethod, SimpleKLRetMethod, and TFIDFRetMethod. |
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add support for scoring an existing document against the collection
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overriding abstract class method with a general efficient inverted index scoring procedure
Reimplemented from RetrievalMethod. Reimplemented in CORIRetMethod. |
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ooverriding abstract class method
Implements RetrievalMethod. |
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Score a query for each passage of a document.
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return the scoring function pointer
Implemented in CORIRetMethod, CosSimRetMethod, OkapiRetMethod, SimpleKLRetMethod, and TFIDFRetMethod. |
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Efficient scoring with the inverted index. a general scoring procedure shared by many different models (assuming "sortedScores has memory allocated) |
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update the query
Implements RetrievalMethod. |
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Modify/update the query representation based on a set (presumably) relevant documents.
Implemented in CORIRetMethod, CosSimRetMethod, OkapiRetMethod, SimpleKLRetMethod, and TFIDFRetMethod. |
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whether or not to cache document representations
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cache document reps.
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number of documents plus 1, the size of the docReps array.
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1.2.18