/query_understanding

query_understanding

Query Understanding Topics

I. Spelling Correction

An improved noisy channel model to start with: https://aclanthology.org/D09-1093.pdf

II. Query Rewritting

1. Query Segmentation

a. Statistical Approach (including word2vec) b. Similar to semantic sequential labeling: also can use other tags: NER, POS, etc.

2. Query Expansion

3. Query Relaxation

4. Query Scoping

"red canada goose coat" (B-color,B-brand,I-brand,B-product)

III. Query Understanding by Facets

good use for autocompletion and query rewritting

IV. Session-based Models

info about recent clicks/refinement pseudo relevance feedback simulates relevance feedback by reinforcing the top-ranked results as if the searcher had provided positive relevance feedback for them.

V. Personalization

info about demographics - autocompletion

VI. Query Auto Completion (QAC)

Most popular completion: lookup recent query history matching prefix input Generative Models: prob n-gram/LM w/o log