124.11.lec16

124.11.lec16 - Click to edit Master subtitle style Dan...

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Unformatted text preview: Click to edit Master subtitle style Dan Jurafsky Lecture 16: Machine Translation: Intro and Classical Models Slide from Chris Manning's 276 class Outline for MT Week Intro and a little history Language Similarities and Divergences Three classic MT Approaches Transfer Interlingua Direct Modern Statistical MT Evaluation Slide from Chris Manning's 276 class What is MT? Translating a text from one language to another automatically. Slide from Chris Manning's 276 class Google Translate The translation http://translate.google.com/translate?hl=en&sl=es&tl=en&u=http% The original recipe for tostones http://www.cocinadominicana.com/acompanamientos-ensaladas-pa Slide from Chris Manning's 276 class Google Translate http://translate.google.com/translate_t http://translate.google.com/translate?hl=en&sl=fr&u=http://www Slide from Chris Manning's 276 class Machine Translation The Story of the Stone (The Dream of the Red Chamber) Cao Xueqin 1792 Chinese gloss : Dai-yu alone on bed top think-of- with-gratitude Bao-chai again listen to window outside bamboo tip plantain leaf of on-top rain sound sigh drop clear cold penetrate curtain not feeling again fall down tears come Hawkes translation : As she lay there alone, Dai-yus thoughts turned to Bao-chai Then she listened to the insistent rustle of the rain on the bamboos and plantains outside her window. The coldness penetrated the curtains of her bed. Almost without Slide from Chris Manning's 276 class Machine Translation Issues: Sentence segmentation: 4 English sentences to 1 Chinese Grammatical differences Chinese rarely marks tense: As, turned to, had begun, tou-> penetrated No pronouns or articles in Chinese Stylistic and cultural differences Bamboo tip plaintain leaf -> bamboos and plantains Ma curtain -> curtains of her bed Rain sound sigh drop -> insistent rustle of the Slide from Chris Manning's 276 class Alignment in Machine Translation Slide from Chris Manning's 276 class Not just literature Hansards: Canadian parliamentary proceeedings Slide from Chris Manning's 276 class What is MT already good enough Tasks for which a rough translation is fine Extracting information (finding recipes!) Web pages email Tasks for which MT can be post-edited MT as first pass Computer-aided human translation Tasks in sublanguage domains where high- quality MT is possible FAHQT Slide from Chris Manning's 276 class What is MT not yet good enough Really hard stuff Literature Natural spoken speech (meetings, court reporting) Really important stuff Medical translation in hospitals 911 calls Slide from Chris Manning's 276 class MT History 1946 Booth and Weaver discuss MT at Rockefeller foundation in New York; 1947-48 idea of dictionary-based direct translation 1949 Weaver memorandum popularized idea 1952 all 18 MT researchers in world meet at MIT 1954 IBM/Georgetown Demo Russian-English MT 1955-65 lots of labs take up MT Slide from Chris Manning's 276...
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124.11.lec16 - Click to edit Master subtitle style Dan...

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