3,037 research outputs found

    Natural language processing

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    Beginning with the basic issues of NLP, this chapter aims to chart the major research activities in this area since the last ARIST Chapter in 1996 (Haas, 1996), including: (i) natural language text processing systems - text summarization, information extraction, information retrieval, etc., including domain-specific applications; (ii) natural language interfaces; (iii) NLP in the context of www and digital libraries ; and (iv) evaluation of NLP systems

    brat: a Web-based Tool for NLP-Assisted Text Annotation

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    We introduce the brat rapid annotation tool (BRAT), an intuitive web-based tool for text annotation supported by Natural Language Processing (NLP) technology. BRAT has been developed for rich structured annotation for a variety of NLP tasks and aims to support manual curation efforts and increase annotator productivity using NLP techniques. We discuss several case studies of real-world annotation projects using pre-release versions of BRAT and present an evaluation of annotation assisted by semantic class disambiguation on a multicategory entity mention annotation task, showing a 15 % decrease in total annotation time. BRAT is available under an opensource license from

    A Comparison and Strategy of Semantic Segmentation on Remote Sensing Images

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    In recent years, with the development of aerospace technology, we use more and more images captured by satellites to obtain information. But a large number of useless raw images, limited data storage resource and poor transmission capability on satellites hinder our use of valuable images. Therefore, it is necessary to deploy an on-orbit semantic segmentation model to filter out useless images before data transmission. In this paper, we present a detailed comparison on the recent deep learning models. Considering the computing environment of satellites, we compare methods from accuracy, parameters and resource consumption on the same public dataset. And we also analyze the relation between them. Based on experimental results, we further propose a viable on-orbit semantic segmentation strategy. It will be deployed on the TianZhi-2 satellite which supports deep learning methods and will be lunched soon.Comment: 8 pages, 3 figures, ICNC-FSKD 201

    A Transition-Based Directed Acyclic Graph Parser for UCCA

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    We present the first parser for UCCA, a cross-linguistically applicable framework for semantic representation, which builds on extensive typological work and supports rapid annotation. UCCA poses a challenge for existing parsing techniques, as it exhibits reentrancy (resulting in DAG structures), discontinuous structures and non-terminal nodes corresponding to complex semantic units. To our knowledge, the conjunction of these formal properties is not supported by any existing parser. Our transition-based parser, which uses a novel transition set and features based on bidirectional LSTMs, has value not just for UCCA parsing: its ability to handle more general graph structures can inform the development of parsers for other semantic DAG structures, and in languages that frequently use discontinuous structures.Comment: 16 pages; Accepted as long paper at ACL201

    Towards authentic tasks and experiences: The example of parser-based CALL

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    Authenticity of language learning tasks, authenticity of learning experiences and the use of authentic language are important characteristics of communicative language teaching and learning. In this article, ways of achieving productive use of authentic language in a computer-assisted language learning environment are discussed. This discussion concentrates on a particular area of CALL-parser-based CALL. The use and adaptation of two existing parsers for two CALL tools that support text production by encouraging learners to concentrate on the linguistic structure – mainly the grammar – of a text they have just produced in a communicative task are outlined to provide concrete evidence for the contribution language processing techniques can make to the field of Computer-Assisted Language Learning.L'authenticité de la tâche langagière à effectuer, de l'expérience d'apprentissage et de l'utilisation de la langue sont des caractéristiques importantes dans l'apprentissage et l'enseignement des langues basés sur une approche communicative. Notre discussion porte sur une exploitation que nous croyons productive de cette langue authentique dans des environnements d'ELAO. Elle se concentre plus particulièrement sur un type d'ELAO, celui base sur le TAL. Nous décrivons l'utilisation et l'adaptation de deux parseurs dans deux systèmes d'ELAO
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