Abstract
Cross-lingual language resources are necessary to realize cross-lingual natural language processing. A large translation dictionary is especially important as such a resource, however, large dictionaries are available for few language pairs and small ones are only available for most language pairs. We propose a novel method to expand a small existing translation dictionary to a large translation dictionary using a pivot language. Cooccurrence vectors in the source language and ones in the destination language are compared based on the small existing translation dictionary, and provide information to select appropriate translations among translation candidates gotten from transitive translation using two translation dictionaries. Experiments that expand the Indonesian-Japanese dictionary using the English language as a pivot language show that the proposed method can improve performance of a real CLIR system.
