Information Retrieval and Web Search

slide1:Introduction to  Information Retrieval (IR)

slide 4: Information Retrieval (IR) Architecture

  • slide 6:IR queries types
    • Keyword queries
    • Boolean queries (using AND, OR, NOT)
    • Phrase queries
    • Proximity queries
    • Full document queries
    • Natural language questions

Slide 13:

  • Information retrieval models
    • Boolean model
    • Vector space model
    • Statistical language model
    • Probabilistic Model

Slide 15:

  • Boolean Model
    • Document Representation: 
    • Query Representation
    • Document Retrieval

Slide 17:

  • Vector space model
    • Document Representation
    • Query representation
    • Retrieval

slide 21:An Example

slide 23: Okapi relevance method

slide 24: Statistical Language Model

slide 27:

  • improving retrieval effectiveness :
    • Relevance feedback
    • Rocchio method

slide 31:

  • Evaluation
    • Precision
    • Recall

Slide 34:Example

slide 35:Precision–Recall Curve & Interpolation

slide 39:Evaluation Using Multiple Queries

slide 40:Rank precision

slide:F-Score

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