Special Topics in Computer Science Advanced Topics in Information Retrieval Chapter 3: Goals: Retrieval Evaluation. Alexander Gelbukh www.Gelbukh.com. Previous chapter. Models are needed for formal operations Boolean model is the simplest
The only valid way of reasoning
Others are lost.
Others are noise.
Two algs: A, B
Which is better?
F-measure: E-measure:user preference Rec vs. Prec
Texts with queries and relevant docs known
Ad-hoc (conventional: query answer)
Routing (ranked filtering of changing collection)
Filtering (changing collection; no ranking)
Interactive (no ranking)
NLP: does it help?
High precision (only 10 docs in answer)
Spoken document retrieval (written transcripts)
Very large corpus (ad-hoc, 20 GB = 7.5 M docs)
Query task (several query versions; does strategy depends on it?)
Till ... ??