A study on automatic creation of a comparable document collection in cross‐language information retrieval

Abstract

Purpose

To present a method for creating a comparable document collection from two document collections in different languages.

Design/methodology/approach

The best query keys were extracted from a Finnish source collection (articles of the newspaper Aamulehti) with the relative average term frequency formula. The keys were translated into English with a dictionary‐based query translation program. The resulting lists of words were used as queries that were run against the target collection (Los Angeles Times articles) with the nearest neighbor method. The documents were aligned with unrestricted and date‐restricted alignment schemes, which were also combined.

Findings

The combined alignment scheme was found the best, when the relatedness of the document pairs was assessed with a five‐degree relevance scale. Of the 400 document pairs, roughly 40 percent were highly or fairly related and 75 percent included at least lexical similarity.

Research limitations/implications

The number of alignment pairs was small due to the short common time period of the two collections, and their geographical (and thus, topical) remoteness. In future, our aim is to build larger comparable corpora in various languages and use them as source of translation knowledge for the purposes of cross‐language information retrieval (CLIR).

Practical implications

Readily available parallel corpora are scarce. With this method, two unrelated document collections can relatively easily be aligned to create a CLIR resource.

Originality/value

The method can be applied to weakly linked collections and morphologically complex languages, such as Finnish.

Citation

Talvensaari, T., Laurikkala, J., Järvelin, K. and Juhola, M. (2006), "A study on automatic creation of a comparable document collection in cross‐language information retrieval", Journal of Documentation, Vol. 62 No. 3, pp. 372-387. https://doi.org/10.1108/00220410610666510