Unit 7 Muddiest point and Reading notes

Muddist Point:

I am Ok with last week's class.

Reading Notes:

9.Relevance feedback and query expansion

9.1 Relevance feedback and pseudo relevance feedback

The basic procedure is:

•  The user issues a (short, simple) query.

•  The system returns an initial set of retrieval results.

•  The user marks some returned documents as relevant or non-relevant.

•  The system computes a better representation of the information need based on the user feedback.

•  The system displays a revised set of retrieval results.

•    The Rocchio algorithm for relevance feedback

Probabilistic relevance feedback

9.2 Global methods for query reformulation

I learn methods for building a thesaurus for query expansion