06 Models for Use-Cases

Transcript

1. Anne Schuth (Blendle / University of Amsterdam, The Netherlands) Krisztian Balog (University of Stavanger, Norway) Tutorial at ECIR 2016 in Padua, Italy Models for Use-Cases
2. Overview • Two use-cases • Product search • Academic literature search • Simple shared approach • Fielded document representation
3. Baseline model • Single-field document retrieval • E.g., BM25 score ( d, q ) = X t2q ft,d · (1 + k1) ft,d + k1(1 b + b |d| avgdl ) · idft
4. Single-field document represenation • Using only product name field • Using catchall field docid R-d3504 product_name LEGO DUPLO Kreatív láda 10817 docid R-d3504 catchall LEGO DUPLO Kreatív láda 10817 Építőjáték, LEGO LEGO Éld ki kreativitásod minden évszakban LEGO DUPLO elemekkel!
5. Fielded extension • Multi-field document retrieval, e.g., BM25F score ( d, q ) = X t2q ˜ ft,d k1 + ˜ ft,d · idft ˜ ft,d = X i wi ft,di Bi Combining term frequencies across fields Field weight Soft normalization for field i
6. Multi-field document representation docid R-d3504 product_name LEGO DUPLO Kreatív láda 10817 brand LEGO DUPLO short_description Éld ki kreativitásod minden évszakban LEGO DUPLO elemekkel! catchall LEGO DUPLO Kreatív láda 10817 Építőjáték, LEGO LEGO Éld ki kreativitásod minden évszakban LEGO DUPLO elemekkel!
7. Incorporating historical feedback • Combining historical score with retrieval score • A simple approach: • or