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Structured Query Evaluation Application

This application (StructQueryEval.cpp) runs retrieval experiments to evaluate the performance of the structured query model using the inquery retrieval method. Feedback is implemented as a WSUM of the original query combined with terms selected using the Rocchio implementation of the TFIDF retrieval method. The expanded query has the form:

wsum( (1-a) <original query>
      a*w1  t1
      a*w2  t2
      ...
      a*wN  tN
      )

where a is the value of the parameter feedbackPosCoeff.

Scoring is either done over a working set of documents (essentially re-ranking), or over the whole collection. This is indicated by the parameter "useWorkingSet". When "useWorkingSet" has a non-zero (integer) value, scoring will be on a working set specified in a file given by "workSetFile". The file should have three columns. The first is the query id; the second the document id; and the last a numerical value, which is ignored. By default, scoring is on the whole collection.

The parameters are:

1. index: The complete name of the index table-of-content file for the database index.

2. QuerySet: the query text stream parsed by ParseInQuery

3. resultFile: the result file

4. resultCount: the number of documents to return as result for each query
5. DefaultBelief: The default belief for a document: Default=0.4
6. feedbackDocCount: the number of docs to use for pseudo-feedback (0 means no-feedback)

7. feedbackTermCount: the number of terms to add to a query when doing feedback.
8. feedbackPosCoeff: the coefficient for positive terms in (positive) Rocchio feedback, as implemented for TFIDF.

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