Speaker: Daniele Pighin NLPRG, TALP Technical University of Catalonia, UPC Date: May 31, 2011 Time: 11:30 Where: Computer Science Faculty, Room 3.2
Title Automatic Projection of Semantic Structures: an Application to Pairwise Translation Ranking Abstract The ability to automatically assess the quality of translation hypotheses is a key requirement towards the development of accurate and dependable translation models. While it is largely agreed that proper transfer of predicate-argument structures from source to target is a very strong indicator of translation quality, especially in relation to adequacy, the incorporation of this kind of information in the Statistical Machine Translation (SMT) evaluation pipeline is still limited to few and isolated cases. We present a model for the inclusion of semantic role annotations in the framework of confidence estimation for machine translation. The model has several interesting properties: 1) it only requires a linguistic processor on the (generally well-formed) source side of the translation; 2) it does not directly rely on properties of the translation model (hence, it can be applied beyond phrase-based systems); 3) it is inherently extendable to cope with different kinds of sequential annotations, e.g., POS tags. These features make it potentially appealing for system ranking, translation re-ranking and user feedback evaluation. Preliminary experiments in pairwise hypothesis ranking on five confidence estimation benchmarks show that the model has the potential to capture salient aspects of translation quality.
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Ixa Group in collaboration with TALP Centre from Technical University of Catalonia is organizing a one-day workshop on The workshop will be held in Barcelona on Friday, November 18, 2011. Paper submission deadline is September 9 2011. See: http://ixa2.si.ehu.es/lihmt2011/ This is part of the dissemination effort of our OpenMT-2 project. |
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Speaker: | In January Iñaki Alegria participated in the XII Simposium de Comunicación Social organized by Centro de Lingüística Aplicada (CLA) in Santiago de Cuba.
The title of his course was: “Computational Morphology: trends, finite-states and open-source” Foma, the application developed by Mans Hulden (University of Helsinki), was the main tool used in this tutorial. As the CLA Centre is celebrating its 40th anniversary this year , they have sent the Ixa Group a sculpture (see the picture) to commemorate our co-operation. THANK YOU VERY MUCH! And CONGRATULATIONS to Eloina, Julio Vitelio, Leonel, and all those compañeros that created this research centre and have been promoting it! |
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IXA group has been collaborating with CLA for 10 years. One of the fruits of this collaboration is the third edition of the Diccionario Básico Escolar (DBE). This dictionary is coded in XML and has been implemented using leXkit, an application developed by Ixa Group for dictionary managing.
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Speaker: Roser Morante
Senior researcher on the BIOGRAPH project led by Walter Daelemans.
CLiPS-Computational Linguistics research group
University of Antwerp,
Date: February 23, 2010
Time: 16:00
Where: Computer Science Faculty, Meeting room (batzar aretoa) .
Modality and negation in natural language processing:
current trends and future directions
Summary: Research on modality and negation focuses on finding subjective, uncertain and counterfactual information in texts, be it in scientific papers, product reviews, or opinions in blogs. This type of +research is concerned with processing texts at the information level and aims at deep text understanding. Modality and negation are phenomena relevant for all applications that are concerned with +some form of text understanding, including text mining, sentiment analysis, recognizing textual entailment, information extraction, text summarization, and question answering. Hence, the adequate +modeling of these phenomena is of crucial importance to the natural language processing (NLP) community as a whole. Whereas from a theoretical perspective, the study of modality has a long tradition, only in the recent years have these topics attracted the attention of NLP researchers. Mainly, the development of +sentiment analysis techniques and the growing need of mining biomedical texts have been the causes for the interest in these semantic aspects of language. In this talk I will define modality and +negation from an NLP perspective, I will motivate the need for processing these phenomena, and I will summarize existing research on processing modality and negation, touching on diverse aspects +ranging from task modelling to feature visualization. Finally, I will speculate about future developments in this research area.
IXA Group is participating with other 5 partners in a new European project: PATHS (2010-2012).
The PATHS project (Personalised Access To cultural Heritage Spaces) primarily addresses objective ICT-2009.4.1: Digital Libraries and Digital Preservation. It relates to target outcome (d), adaptive cultural experiences, by creating personalised views of various forms of cultural expression, adapting these views to the background and cognitive context of the user and offering meaningful guidance about the interpretation of cultural works. PATHS will make important progress in this direction.
Europeana: Significant amounts of cultural heritage material are now available through online digital library portals. However, this vast amount of cultural heritage material can also be overwhelming for many users who are provided with little or no guidance on how to find and interpret this information.
The PATHS project will create a system that acts as an interactive personalised tour guide through existing digital library collections. The system will offer suggestions about items to look at and assist in their interpretation. Navigation will be based around the metaphor of a path through the collection. A path can be based around any theme, for example artist and media (“paintings by Picasso”), historic periods (“the Cold War”), places (“Venice”) and famous people (“Muhammad Ali”). Users will be able to construct their own paths or follow pre-defined ones.
The PATHS project will provide users with innovative ways to access and utilise the contents of digital libraries that enrich their experiences of these resources. This will be achieved by extending the state-of-the-art in user-driven information access and by applying language technologies to analyse and enrich online content. The project will take a user-centred approach to development to accommodate the needs, interests and preferences of different types of users.
These goals shall be realised through the following objectives :
- Analysis of users’ requirements for access to Cultural Heritage collections
- Organisation and enrichment of Cultural Heritage content for use within a navigation system
- Implementation of a system for navigating Cultural Heritage resources
- Techniques for providing personalised access to Cultural Heritage content
- Porting the navigation system for use on mobile devices and Facebook
- Evaluation with user groups and in field trials
Therefore, the project will research on the following areas:
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Information Access: The project will develop a user-driven navigation through collections of information, gathering the users’ requirements and modeling it.
- Educational Informatics: Adapting to individual learners in relation to being directed and being allowed the freedom to explore autonomously.
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Content interpretation and enrichment: Representation and sharing of information about items, and identifying background information related to the items in cultural heritage collections
IXA Group will work mainly in content processing and enrichment. This means that content from Cultural Heritage sources will processed to a multi-layered network and augmented with additional information that will enrich the user’s experience. The additional information will include links between items in the collection and to external sources like Wikipedia or other relevant collections. The resulting multi-layered network will form the basis for the paths used to navigate the collection.
The PATHS consortium contains six partners.
- Two academic institutions:
- University of Sheffield (USFD), UK (Coordinator).
- Universidad del País Vasco / Euskal Herriko Unibertsitatea (UPV/EHU ), Basque Country
- Two SMEs:
- i-sieve Technologies Ltd . Greece.
- Asplan Viak Internet (Avinet), Norway.
- Two cultural heritage enterprises
- MDR Partners , UK (Project Management).
- Alinari 24 Ore Spa , Italy
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