Langauge Models for Information Retrieval
In information retrieval (henceforth IR), the language modeling approach is a form of probabilistic retrieval. Unlike traditional probabilistic methods, whic...
Information Retrieval
Systematic Evaluation for Information Retrieval: MAP and nDCG
The effectiveness (or accuracy) of an information retrieval system refers to how well it ranks relevant documents higher than non-relevant ones. Evaluating t...
Understanding BM25 in Text Retrieval
When you type a query into a search engine, it finds documents that contain your keywords. The problem is: how do you order those documents from most to leas...
Building Korean Query Auto-completion using Elasticsearch
Query auto-completion (QAC) is a feature that suggests completions for a user’s input query. It tries to guess what you’re about to type and throws out sugge...
Building Faceted Search using Elasticsearch
Faceted search Faceted search is a type of search that enables users to narrow down search results by applying multiple filters based on predefined facets, w...