Given a test document, our approach imitates this procedure by first retrieving similar bilingual document pairs from the training parallel corpus, which has often been applied in IR-based adaptation of SMT systems (Zhao et al.2004;Hildebrand et al.2005;Lu et al.2007) and then extracting bilingual phrase pairs from similar bilingual document pairs to store them in a static cache.
such a cache-based approach may introduce many noisy/unnecessary bilingual phrase pairs in both the static and dynamic caches.