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Statistical Machine Translation

Raghav Bashyal. Statistical Machine Translation. Statistical Machine Translation. Uses pre-translated text (copora) Compare translated text to original Notice patterns, associate words. SMT Process. Knight – A Statistical Translation Workbook Basic probabilities P(word)

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Statistical Machine Translation

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  1. Raghav Bashyal Statistical Machine Translation

  2. Statistical Machine Translation • Uses pre-translated text (copora) • Compare translated text to original • Notice patterns, associate words

  3. SMT Process • Knight – A Statistical Translation Workbook • Basic probabilities • P(word) • Conditional probabilities • P(word | word) • … • Pick the most probable translation

  4. SMT process http://isoft.postech.ac.kr/research/SMT/images/math.jpg

  5. Project • Translate basic text from Spanish to English • Test effectiveness • with/without hard-coded components (syntax) • Specific procedures/algorithms that add speed

  6. Literature • Guides on Statistical Machine Translation • Most research project follow the same procedure as outlined by Knight • “state of the art” implementation • Google

  7. Literature • NLTK • Christina Wallin • UC Berkeley • Modifications • Larger corpora more useful • Syntax based • hard-code • Higher translation quality when used with SMT

  8. Procedure • NLTK – Natural Language ToolKit • Python • Made from Natural Language processing projects • Current procedure – read the SMT worksheet • Code along with worksheet

  9. Development • Create corpora • Tokenization • Clean string • Probability • P(word) in corpora

  10. Expected Results • Probably will be very basic translation • Usually perform better with “sample” text than “real” text • Highlighted errors • Program should use reference data to find some errors • Error frequency plots for certain words • Test the effectiveness of adjustments • Hard coding, other algorithms

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