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Introduction Machine Translation (MT) Translate one natural - PDF document

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24.01.2012 HOW MACHINE TRANSLATION OF WEB PAGES WORKS ? E-BUSINESS TECHNOLOGIES, BCM1, WS 2011 Student: Lei Sio Meng Professor: Dr. Eduard Heindl Introduction Machine Translation (MT) Translate one natural language to other language by

  1. 24.01.2012 HOW MACHINE TRANSLATION OF WEB PAGES WORKS ? E-BUSINESS TECHNOLOGIES, BCM1, WS 2011 Student: Lei Sio Meng Professor: Dr. Eduard Heindl Introduction • Machine Translation (MT) • Translate one natural language to other language by the computational power of computer • When computer was developed, MT has brought up • A demonstration to solve the MT as early as 1950’s 1

  2. 24.01.2012 Introduction • Processing was slow before 1980’s • the result is poor • computation ability not enough to solve MT problem • After 1980s’, people pay attention back to MT • the growth of computation • Nowadays, different approaches can be implement • rule-based machine translation (RBMT) • statistical machine translation (SMT )… Introduction • Web make a new stage of MT after 1990s’ • The application of MT in Global, also e-Business becomes more important • 260 countries are connected by internet, over 26 major languages. • Non-English language speakers take about 43 percent of online population. 2

  3. 24.01.2012 Introduction • Key issue of web page in globalization: • How user gets Multi-language information • How to present and translate information of company • Solution: Web based Machine Translation services • General • Fast • Instant • Effective • Low-cost • For accurate result, still need human post-edit • MT can speed-up the process of traditional translation 6 Web-MT Service • Various translation service • For instance: Google translate Online translator Document/ web page translation 3

  4. 24.01.2012 7 Web-MT Service Web Page integration Browser integration Mobile version Basic Work flow • Build a client/server translation service by various architectures • Provide translation service by connect web server • MT application still relies on tradition MT approach • Different translation language rules and approaches will be developed • as a series of modules • in the back-end server side • Front-end client interface accept the translate requirement , send to server side • Result send back to client after processing 4

  5. 24.01.2012 Basic Work flow MT Modules Resources Approaches Probabilistic Source Language Module 1 Data/Corpus SMT Lexicon/ Module 2 Dictionary RBMT Target Language Client Web Module 3 Grammar Rule Interface Machine . . . Translation Server . . . . . . E.g. Use Google translator to translate English to Germany. English = Source language (SL) Germany = Target language (TL) Basic Work flow • Different Resource: • Different MT approaches • rule-based (RBMT) – Probabilistic data • statistical (SMT), – Lexicon • example-based – Grammar rule • hybrid (RBMT + SMT)… • Different Modules • HTML fetching • Word segmentation • Part of Speech tagging… • Depend on MT approaches 5

  6. 24.01.2012 Translation approaches 1st Generation 3rd Generation 2nd Generation (1960s - 1980s) (1980s - ) (1990s - ) • Direct approach • Corpus-Based • Rule-Based approach • Example • Transfer • Statistical • Interlingua 1 st Generation is simple 2 nd Generation is Linguistic analysis approaches, 3 rd Generation is using corpus to train a statistical data for obtain result. Direct approach • Earliest, basic approach • Dictionary Approach • Linguist Model is not involved • Translate words by words • Result is poor Translation Source Language Dictionaries Target Language Text Text 6

  7. 24.01.2012 Transfer approach • 3 Steps: Analysis: Parses input into Abstract Source Representation 1. ( SL Intermediate ) Transfer: Translate Intermediate into Abstract Target 2. Representation (TL Intermediate) Generation: Map TL Intermediate into output 3. SL TL Intermediate Intermediate Source Language Target Language Text Text Transfer Stage: Analysis Stage: Generate Stage: Bilingual Dictionary + SL Dictionary + TL Dictionary + Grammar rule Grammar rule Grammar rule Interlingua approaches • Similar as Transfer approach • 2 steps: Analysis: input is converted to one Interlingua representation 1. - A summarized, abstract meaning, Neutral Universal Language General: transfer Interlingua to target text 2. Interlingua representation Source Language Target Language Analysis Stage: Generate Stage: Text Text Source Dictionary + Target Dictionary + Grammar rule Grammar rule 7

  8. 24.01.2012 Statistical Machine approaches • The most widely-use approach • Training a large Parallel Bilingual Corpus • Bilingual corpus is a set of documentations with SL, TL and translated relationship • Easier to build Multilingual MT • No matter the closely or un-closely language-pair Statistical Machine approaches Input text is segmented into phrases and strings 1. Translate word segments by probability theory and training 2. data Arranging, combining the Segments by probability theory 3. and training data Parallel bilingual corpus Source Target Segments Segments Target Language Source Language Text Text Translation Language Model Model 8

  9. 24.01.2012 Statistical Machine approaches • Statistical approach is implemented by Bayes’ rule 𝑄(𝑈|𝑇) = 𝑄 𝑈 𝑄(𝑇|𝑈) Language Model Translation Model • Translation Model • calculating probabilities of matching the source segments to target segment by a bilingual corpus • Language Model • calculating best sequences from target segments and combine them as a final output Example-Based approaches • Uses the aligned bilingual corpus and TL model Input is decomposed into a set of segments 1. Translated to target segments 2. • Find a closely translation-pair example from Examples in Aligned bilingual corpus. Target segments recombined together to be a target output text. 3. Aligned bilingual corpus Source Target Segments Segments Target Language Source Language Text Text Target Language Model 9

  10. 24.01.2012 19 Example-Based approaches • MT system is “ Imitating ” the translation of similar segment in corpus She sells flowers in the farmers’ market every day Decomposed She sells flowers every day in the farmers’market Example: Example: The lady in the farmers’ market Translation She sells flowers every day -> is my cousin -> Dia menjual bunga setiap hari. Wanita di pasar tani itu ialah sepupu saya. Dia menjual bunga setiap hari di pasar tani itu Recombined Dia menjual bunga di pasar tani itu setiap hair. Hybrid approach • Build rule-based MT is expensive • Add linguistic rule, the result will be inconsistent • Add new language is different • Statistical approach can’t reach the quality for people to fully understand • Especially when translating long sentences • New idea: Build Hybrid approach • E.g. SYSTRAN: Hybrid Rule-based + Statistical approach in 2010 10

  11. 24.01.2012 Modules and Resources • Varies modules and resources are used between different MT applications • Case: Multi-languages MT system based on the Statistical approaches Resource Module Word-to-Word Bilingual Corpus Alignment SL Text Translation Segment Extraction Model Statistical Translator Segment Table Language Associated Monolingual Corpus Model Sequence TL Text Process and architectures of Web MTs • Varies architectures are used between MT applications • Case 1: Translate English to Bangla and Punjabi to Hindi HTML Source Parsing SL Translate TL Text Replace Modified HTML Content Text Code Code Parsing HTML Source Code : Use a HTML Parser, omits HTML tags, obtain 1. content texts, combined as a SL input text Translate input text to TL Text 2. Modifying original HTML code: Replace SL content by the TL text. The 3. modified HTML code redirected to client 11

  12. 24.01.2012 Process and architectures of Web MTs • Case 2: Web MT translates Arabic, Chinese, Spanish to English by statistical approach Web Page (form) Client CGI script Server MT front-end Languages 1 Languages 2 Languages 3 ... … Wrapper Wrapper Wrapper Pre- Pre- Pre- Processing Processing Processing MT MT MT System System System Process and architectures of Web MTs • 2-Level Layer architecture Web Page (form) • Web site user-interface : user input SL text and Client choose language-pair CGI script Server MT front-end • Send request by HTML form • A CGI (Common Gateway Interface) : Communicate between web site and machine translator in server side • MT front-end : Forward translation requests to appropriate languages wrapper. 12

  13. 24.01.2012 Process and architectures of Web MTs • Different Language-pair wrappers (as Chinese to English, Spanish to English) Server Languages 1 Wrapper • Include kernel of MT system • Also Pre-processing module for SL Pre- Processing MT • The Translation implement MT program, result System send back to client by opposition direction . Process and architectures of Web MTs • Case 3: Use Moses toolkit to build 3 different web MT systems • Moses is a open-source development software • Design 1: Client A Client B Client C Client Server Apache Web Server Tomcat Server Moses Toolkit Translate Translate Modules Modules Language Pair 1 Language Pair 4 Translate Translate Modules Modules Language Pair 2 Language Pair 3 13

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