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. Constructing a Chinese-Japanese Parallel Corpus from Wikipedia Chenhui Chu, Toshiaki Nakazawa , Sadao Kurohashi (Graduate School of Informatics, Kyoto University). Common Chinese characters. Common Chinese characters. Background. Features. Baseline features

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  1. . Constructing a Chinese-Japanese Parallel Corpus from WikipediaChenhui Chu, Toshiaki Nakazawa, SadaoKurohashi (Graduate School of Informatics, Kyoto University) . . Common Chinese characters Common Chinese characters Background Features • Baseline features • General features: sentence length, word overlap • Word alignment features Seed parallel corpus • Lack of Chinese-Japanese parallel corpora for SMT Common Chinese characters filtering Bilingual dictionary Inter-language link Novel features • Chinese character features (+CC) Filter Classifier Zh: 而被指定为政令指定都市、中核市、特例市。 Ja: 別途政令指定都市、中核市、特例市に定められている。 c (1) (2) (3) Parallel sentences • Non-CC word features (+Non-CC) Article pairs # http://orchid.kuee.kyoto-u.ac.jp/ASPEC/ Parallel sentence candidates Zh: 日本的一级行政区划单位为都道府县,全国划分为 1都、1道、2府、43县。 Zh-Ja Wikipedia • Chinese-Japanese Wikipedia Seed parallel corpus Zh: ... 日本的一级行政区划单位为都道府县,全国划分为1都、1道、2府、43县。部份市因人口较多,在当地影响较大,而被指定为政令指定都市、中核市、特例市。都道府县下的行政区划为市町村,此外还有郡、支厅、区、特别区等行政单位。 ... Ja: ... 都道府県(1都1道2府43県)という広域行政区画から構成される。但し、地域区分(地方区分)には、揺れが見られる。また、一部の市は、行政上、別途政令指定都市、中核市、特例市に定められている。他にも、市町村や、町村をまとめた郡がある(全国市町村一覧参照)。 ... Ja: 都道府県(1都1道2府43県)という広域行政区画から構成される。 Bilingual dictionary Cartesian product Positive instances • Content word features (+Con) Filter Classifier Zh: YY/的/尸体/,/和/活着/的/黑/猩猩/相比/,/皮肤/的/颜色/看起来/稍微/明朗/一些/。 Ja: つぎに/,/配線/に/使用/する/パターン/幅/や/クリアランス/の/設定/の/方法/を/説明/した/。 Negative instances Filtered non-parallel sentence pairs Non-parallel sentence pairs 1 3 Parallel Sentence Extraction System Experiments p • Overview • Classification results with WF • Extraction results (#extracted sentences [unit: k]) • Parallel sentence candidate filtering • WF: dictionary-based word overlap (Baseline) • CCF: common Chinese character (cognate) overlap • WF and CCF: logical conjunction of WF and CCF • WF or CCF: logical disjunction of WF and CCF • Parallel sentence classifier • MT results (BLEU-4) # The resource is freely available at: http://orchid.kuee.kyoto-u.ac.jp/~chu/resource/wiki_zh_ja.tgz 2 4

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