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Searching for the Best MT Combination
- 1. Matīss Rikters Searching for the Best Machine Translation Combination Tartu, Estonia 22.03.2017
- 2. Machine Translation Hybrid Machine Translation Methods I used • A count-based language model for candidate selection from full whole translations • Combining translations of sentence chunks • Combining translations of linguistically motivated chunks • A character-level neural language model for candidate selection A graphical implementation of the methods Translation of multiword expressions Other academic activities Future plans Contents
- 3. • Machine translation (MT) is a sub-field of natural language processing that investigates the use of computers to translate text from one language to another • Statistical MT (SMT) consists of subcomponents that are separately engineered to learn how to translate from vast amounts of translated text • Rule-based MT (RBMT) is based on linguistic information covering the main semantic, morphological, and syntactic regularities of source and target languages • Neural MT (NMT) consists of a large neural network in which weights are trained jointly to maximize the translation performance Machine Translation
- 4. • One of the first metrics to report high correlation with human judgments • One of the most popular in the field • The closer MT is to a professional human translation, the better it is • Scores a translation on a scale of 0 to 100 Automatic Evaluation of MT: BLEU
- 5. Statistical rule generation • Rules for RBMT systems are generated from training corpora Multi-pass • Process data through RBMT first, and then through SMT Multi-System hybrid MT • Multiple MT systems run in parallel • SMT + RBMT (Ahsan and Kolachina, 2010) • Confusion Networks (Barrault, 2010) + Neural Network Model (Freitag et al., 2015) • SMT + EBMT + TM + NE (Santanu et al., 2014) • Recursive sentence decomposition (Mellebeek et al., 2006) Literature Review: Hybrid Machine Translation
- 6. Combining full whole translations • Translate the full input sentence with multiple MT systems • Choose the best translation as the output Combining translations of sentence chunks • Split the sentence into smaller chunks • The chunks are the top level subtrees of the syntax tree of the sentence • Translate each chunk with multiple MT systems • Choose the best translated chunks and combine them Combining Translations
- 7. KenLM (Heafield, 2011) calculates probabilities based on the observed entry with longest matching history 𝑤𝑓 𝑛 : 𝑝 𝑤 𝑛 𝑤1 𝑛−1 = 𝑝 𝑤 𝑛 𝑤𝑓 𝑛−1 𝑖=1 𝑓−1 𝑏(𝑤𝑖 𝑛−1 ) where the probability 𝑝 𝑤 𝑛 𝑤𝑓 𝑛−1 and backoff penalties 𝑏(𝑤𝑖 𝑛−1 ) are given by an already-estimated language model. Perplexity is then calculated using this probability: where given an unknown probability distribution p and a proposed probability model q, it is evaluated by determining how well it predicts a separate test sample x1, x2... xN drawn from p. Candidate Selection
- 8. Teikumu dalīšana tekstvienībās Tulkošana ar tiešsaistes MT API Google Translate Bing Translator LetsMT Labākā tulkojuma izvēle Tulkojuma izvade Sentence tokenization Translation with online MT Selection of the best translation Output Whole Translations
- 9. Teikumu dalīšana tekstvienībās Tulkošana artiešsaistes MT API Google Translate Bing Translator LetsMT Labāko fragmentu izvēle Tulkojumu izvade Teikumu sadalīšana fragmentos Sintaktiskā analīze Teikumu apvienošana Sentence tokenization Translation with online MT Selection of the best chunks Output Syntactic analysis Sentence chunking Sentence recomposition Chunks
- 10. An advanced approach to chunking • Traverse the syntax tree bottom up, from right to left • Add a word to the current chunk if • The current chunk is not too long (sentence word count / 4) • The word is non-alphabetic or only one symbol long • The word begins with a genitive phrase («of ») • Otherwise, initialize a new chunk with the word • When chunking results in too many chunks, repeat the process, allowing more (than sentence word count / 4) words in a chunk Candidate Selection: 12-gram LM trained with • KenLM • DGT-Translation Memory corpus (Steinberger, 2011) 3.1 million legal domain sentences • Sentences scored with the query program from KenLM Test data • 1581 random sentences from the JRC-Acquis corpus • ACCURAT balanced evaluation corpus Linguistically Motivated Chunks CICLing 2016
- 11. Linguistically Motivated Chunks Simple chunks Linguistically motivated chunks • Recently • there • has been an increased interest in the automated automated discovery of equivalent expressions expressions in different languages • . • Recently there has been an increased interest
- 12. 16.00 17.00 18.00 19.00 20.00 21.00 22.00 23.00 24.00 25.00 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 0.11 0.20 0.32 0.41 0.50 0.61 0.70 0.79 0.88 1.00 1.09 1.20 1.29 1.40 1.47 1.56 1.67 1.74 1.77 BLEU Perplexity Epoch Perplexity BLEU-HY Linear (BLEU-HY) Neural Language Models 13.30 13.80 14.30 14.80 15.30 15.80 16.30 15.00 20.00 25.00 30.00 35.00 40.00 45.00 50.00 BLEU Perplexity Epoch Perplexity BLEU Linear (BLEU)
- 13. System BLEU Whole translations – G+B (Rikters 2015) 17.70 Simple Chunks– G+B (Rikters and Skadiņa 2016a) 17.95 Linguistic Chunks – G+B (Rikters and Skadiņa 2016b) 18.29 Linguistic Chunks – G+B+H+Y (Rikters and Skadiņa 2016b) 19.21 + Char-RNN Neural Language Model (Rikters 2016d) 19.51 Some Results Baselines BLEU Bing 17.43 Google 17.63 Hugo.lv 17.14 Yandex 16.04
- 14. Start page Translate with onlinesystems Inputtranslations to combine Input translated chunks Settings Translation results Inputsource sentence Inputsource sentence Interactive MS MT (Rikters 2016a)
- 15. Translation of Multi-Word Expressions (MWEs) Find & Mark MWE candidates in corpora Pre-process monolingual texts with TreeTagger Extract MWE candidate lists from corpora Mark MWE candidates in text Find translation equivalents for monolingual MWE candidates with MPAligner Monolingual MWE extraction and annotation MWE alignment SMT Experiments Adding data to the parallel corpora Adding a second translation table Adding a sixth feature to the translation table Using the Jaccard Index for translation probabilities Using a Levenshtein distance-based similarity metric for translation probabilities Method BLEU Baseline 62.23 Baseline + MWE training data 62.10 Baseline + 2nd translation table 62.04 Baseline + 6th feature 62.37
- 16. MWEs in Neural Machine Translation English-Latvian English-Czech Training Validation 2.5M 1xMWE 2.5M 2xMWE 5M 2xMWE 5M 1M 1xMWE 1M 2xMWE 2M 2xMWE 0.5M
- 17. • Matīss Rikters "Multi-system machine translation using online APIs for English-Latvian" The Fourth Workshop on Hybrid Approaches to Translation (2015) • Matīss Rikters and Inguna Skadiņa "Syntax-based multi-system machine translation" The 10th edition of the Language Resources and Evaluation Conference (2016a) • Matīss Rikters and Inguna Skadiņa "Combining machine translated sentence chunks from multiple MT systems" The 17th International Conference on Computational Linguistics and Intelligent Text Processing (2016b) • Matīss Rikters "K-translate – interactive multi-system machine translation" 12th International Baltic Conference on Databases and Information Systems (2016a) • Matīss Rikters “Searching for the Best Translation Combination Across All Possible Variants” The 7th Conference on Human Language Technologies - the Baltic Perspective (2016b) • Matīss Rikters “Interactive Multi-System Machine Translation with Neural Language Models” IOS Press Ebook (2016c) • Matīss Rikters “Neural Network Language Models for Candidate Scoring in Hybrid Multi-System Machine Translation” The Sixth Workshop on Hybrid Approaches to Translation (2016d) Publications CICLing 2016
- 18. • Matīss Rikters and Ondřej Bojar "Handling Multi-Word Expressions in Neural Machine Translation" Publications in Progress
- 20. Teaching • Supervised multiple course, qualification and bachelor theses • Average grade 8.67 • Student curator Attended Summer / Winter Schools • Machine Translation Marathon 2015 • Deep Learning For Machine Translation 2015 • ParseME 2nd Training School • Neural Machine Translation Marathon 2016 Other Academic Activities
- 21. Future Work • Complete experiments and inspect results for English – Estonian • Win WMT17 news translation task • At least for English-Latvian • At least beat Tilde • Perform chunking on the target side • Get chunks from dependency parses • Complete PhD thesis draft • Pass final exams • Experiment with other types of LMs for candidate selection • Factored Language Models (POS tag + lemma) • Convolutional Neural Network Language Models • Perform candidate selection using MT quality estimation • QuEst++ (Specia et al., 2015) • SHEF-NN (Shah et al., 2015)
- 22. Ahsan, A., and P. Kolachina. "Coupling Statistical Machine Translation with Rule-based Transfer and Generation, AMTA-The Ninth Conference of the Association for Machine Translation in the Americas." Denver, Colorado (2010). Barrault, Loïc. "MANY: Open source machine translation system combination." The Prague Bulletin of Mathematical Linguistics 93 (2010): 147-155. Heafield, Kenneth. "KenLM: Faster and smaller language model queries." Proceedings of the Sixth Workshop on Statistical Machine Translation. Association for Computational Linguistics, 2011. Kim, Yoon, et al. "Character-aware neural language models." arXiv preprint arXiv:1508.06615 (2015). Mellebeek, Bart, et al. "Multi-engine machine translation by recursive sentence decomposition." (2006). Mikolov, Tomas, et al. "Recurrent neural network based language model." INTERSPEECH. Vol. 2. 2010. Petrov, Slav, et al. "Learning accurate, compact, and interpretable tree annotation." Proceedings of the 21st International Conference on Computational Linguistics and the 44th annual meeting of the Association for Computational Linguistics. Association for Computational Linguistics, 2006. Raivis Skadiņš, Kārlis Goba, Valters Šics. 2010. Improving SMT for Baltic Languages with Factored Models. Proceedings of the Fourth International Conference Baltic HLT 2010, Frontiers in Artificial Intelligence and Applications, Vol. 2192. , 125-132. Rikters, M., Skadiņa, I.: Syntax-based multi-system machine translation. LREC 2016. (2016a) Rikters, M., Skadiņa, I.: Combining machine translated sentence chunks from multiple MT systems. CICLing 2016. (2016b) Santanu, Pal, et al. "USAAR-DCU Hybrid Machine Translation System for ICON 2014" The Eleventh International Conference on Natural Language Processing. , 2014. Schwenk, Holger, Daniel Dchelotte, and Jean-Luc Gauvain. "Continuous space language models for statistical machine translation." Proceedings of the COLING/ACL on Main conference poster sessions. Association for Computational Linguistics, 2006. Shah, Kashif, et al. "SHEF-NN: Translation Quality Estimation with Neural Networks." Proceedings of the Tenth Workshop on Statistical Machine Translation. 2015. Specia, Lucia, G. Paetzold, and Carolina Scarton. "Multi-level Translation Quality Prediction with QuEst++." 53rd Annual Meeting of the Association for Computational Linguistics and Seventh International Joint Conference on Natural Language Processing of the Asian Federation of Natural Language Processing: System Demonstrations. 2015. Steinberger, Ralf, et al. "Dgt-tm: A freely available translation memory in 22 languages." arXiv preprint arXiv:1309.5226 (2013). Steinberger, Ralf, et al. "The JRC-Acquis: A multilingual aligned parallel corpus with 20+ languages." arXiv preprint cs/0609058 (2006). References
- 23. Aitäh!