Auto-Generation of NVEF Knowledge in Chinese

Noun-verb event frame (NVEF) knowledge in conjunction with an NVEF word-pair identifier [Tsai et al. 2002] comprises a system to support natural language processing (NLP) and natural language understanding (NLU). In [Tsai et al. 2002a], we demonstrated that NVEF knowledge can be used effectively to resolve the Chinese word-sense disambiguation (WSD) problem with 93.7% accuracy for nouns and verbs. In [Tsai et al. 2002b], we have shown that NVEF knowledge can be applied on the Chinese syllable-to-word (STW) conversion problem to achieve 99.66% accuracy for the NVEF related portions of Chinese sentences. In [Tsai et al. 2002a], we defined a collection of NVEF knowledge as an NVEF word-pair (a meaningful NV word-pair) and its corresponding NVEF sense-pairs. No existing methods exist that can fully automatically find collections of NVEF knowledge from Chinese sentences. We propose a method for automatically acquiring large-scale NVEF knowledge without human intervention in order to identify a large, varied range of NVEF-sentences (sentences containing at least one NVEF word-pair). The auto-generation of NVEF knowledge (AUTO-NVEF) includes four major processes: (1) segmentation check; (2) Initial Part-of-Speech (IPOS) sequence generation; (3) NV knowledge generation; and (4) NVEF knowledge auto-confirmation. Our experiment results show that AUTO-NVEF achieves 98.52% accuracy for news and 96.41% for specific text types, which include research report, classical literature and modern literature. AUTO-NVEF automatically discovered over 400,000 NVEF word-pairs from the 2001 United Daily News (2001 UDN) corpus. According to our estimation, the acquired NVEF knowledge from 2001 UDN helps to identify 54% of NVEF-sentences in the Academia Sinica Balanced Corpus (ASBC), and 60% in the 2001 UDN corpus. We plan to expand NVEF knowledge to be able to identify more than 75% of NVEF-sentences in ASBC. We will also apply the acquired NVEF knowledge to support other NLP and NLU researches, such as machine translation, shallow parsing, syllable and speech understanding and text indexing. The auto-generation of bilingual, especially Chinese-English, NVEF knowledge will be also addressed in our future work.