Sökning: "Joakim Nivre"

Visar resultat 26 - 29 av 29 avhandlingar innehållade orden Joakim Nivre.

  1. 26. Text Harmonization Strategies for Phrase-Based Statistical Machine Translation

    Författare :Sara Stymne; Lars Ahrenberg; Joakim Nivre; Nizar Habash; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; HUMANIORA; HUMANITIES; Statistical machine translation; text harmonization; compound words; definiteness; reordering; unknown words;

    Sammanfattning : In this thesis I aim to improve phrase-based statistical machine translation (PBSMT) in a number of ways by the use of text harmonization strategies. PBSMT systems are built by training statistical models on large corpora of human translations. This architecture generally performs well for languages with similar structure. LÄS MER

  3. 27. Understanding Neural Machine Translation : An investigation into linguistic phenomena and attention mechanisms

    Författare :Gongbo Tang; Joakim Nivre; Rico Sennrich; Philipp Koehn; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Neural machine translation; Linguistic phenomena; Ambiguity; Long-range dependency; Morphology; Negation; Attention mechanisms; Interpretation; Computational Linguistics; Datorlingvistik;

    Sammanfattning : In this thesis, I explore neural machine translation (NMT) models via targeted investigation of various linguistic phenomena and thorough exploration of the internal structure of NMT models, in particular the attention mechanism. With respect to linguistic phenomena, I explore the ability of NMT models to translate ambiguous words, to learn long-range dependencies, to learn morphology, and to translate negation—linguistic phenomena that have been challenging for the older paradigm of statistical machine translation. LÄS MER

  4. 28. Recycling Translations : Extraction of Lexical Data from Parallel Corpora and their Application in Natural Language Processing

    Författare :Jörg Tiedemann; Anna Sågvall Hein; Joakim Nivre; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computational linguistics; word alignment; parallel corpora; translation corpora; computational lexicography; machine translation; Datorlingvistik; Computational linguistics; Datorlingvistik;

    Sammanfattning : The focus of this thesis is on re-using translations in natural language processing. It involves the collection of documents and their translations in an appropriate format, the automatic extraction of translation data, and the application of the extracted data to different tasks in natural language processing. LÄS MER

  5. 29. Predicting Linguistic Structure with Incomplete and Cross-Lingual Supervision

    Författare :Oscar Täckström; Joakim Nivre; Jussi Karlgren; Ryan McDonald; Hal Daumé III; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; linguistic structure prediction; structured prediction; latent-variable model; semi-supervised learning; multilingual learning; cross-lingual learning; indirect supervision; partial supervision; ambiguous supervision; part-of-speech tagging; dependency parsing; named-entity recognition; sentiment analysis; Computational Linguistics; Datorlingvistik;

    Sammanfattning : Contemporary approaches to natural language processing are predominantly based on statistical machine learning from large amounts of text, which has been manually annotated with the linguistic structure of interest. However, such complete supervision is currently only available for the world's major languages, in a limited number of domains and for a limited range of tasks. LÄS MER