Tree Edit Distance Learning via Adaptive Symbol Embeddings

Metric learning has the aim to improve classification accuracy by learning a distance measure which brings data points from the same class closer together and pushes data points from different classes further apart. Recent research has demonstrated that metric learning approaches can also be applied to trees, such as molecular structures, abstract syntax trees of computer programs, or syntax trees of natural language, by learning the cost function of an edit distance, i.e. the costs of replacing, deleting, or inserting nodes in a tree. However, learning such costs directly may yield an edit distance which violates metric axioms, is challenging to interpret, and may not generalize well. In this contribution, we propose a novel metric learning approach for trees which we call embedding edit distance learning (BEDL) and which learns an edit distance indirectly by embedding the tree nodes as vectors, such that the Euclidean distance between those vectors supports class discrimination. We learn such embeddings by reducing the distance to prototypical trees from the same class and increasing the distance to prototypical trees from different classes. In our experiments, we show that BEDL improves upon the state-of-the-art in metric learning for trees on six benchmark data sets, ranging from computer science over biomedical data to a natural-language processing data set containing over 300,000 nodes.Comment: Paper at the International Conference of Machine Learning (2018), 2018-07-10 to 2018-07-15 in Stockholm, Swede

From despair to somewhere: activating students in a distance learning environment

Student engagement in part-time and distance learning is critical in terms of retention and progression. But ideas about engagement often focus on academic priorities and on students who collude with the concept of being “active” learners. To establish a virtual community called Student Connections the faculty of Social Sciences at The Open University held a one week online conference where students and academics presented their ideas. Supported by two audio downloads, a drama “This Student Life” and a news magazine “The Podmag”, students were encouraged to attend online ‘Activate sessions’ where they became part of a community and worked on collaborative extracurricular projects that were presented at the Student Connections conference. In reviewing the process of engagement it is proposed that there were four levels; ‘super-engaged’ ‘critically-engaged’, ‘passively-engaged’ and ‘none-engaged’. This paper includes a discussion about the importance of these groups in establishing a community and makes suggestions for further research into student engagement

Distance learning of foreign languages

doi: 10.1017/S0261444806003727This article provides a critical overview of the field of distance language learning, challenging the way in which the field is often narrowly conceptualised as the development of technology-mediated language learning opportunities. Early sections focus on issues of concept and definition and both theoretical and pedagogical perspectives on the field. Emphasis is placed on evident shifts from a concern with structural and organisational issues to a focus on transactional issues associated with teaching/learning opportunities within emerging paradigms for distance language learning. The next section reviews choices and challenges in incorporating technology into distance language learning environments, foregrounding decisions about technology made in particular sociocultural contexts, the contribution of ‘low-end’ technologies and research directions in developing new learning spaces and in using online technologies. The investigation of learner contributions to distance language learning is an important avenue of enquiry in the field, given the preoccupation with technology and virtual learning environments, and this is the subject of section six. The two final sections identify future research directions and provide a series of conclusions about research and practice in distance language learning as technology-mediated interactions increasingly come to influence the way we think about the processes of language learning and teaching

Issues in equivalence: Information literacy and the distance student

Information Literacy is a recognised lifelong learning skill, and an expected graduate attribute. With the growth in distance provision of tertiary education it is important to acknowledge the barriers faced by distance students and the difficulties libraries face in delivering equivalent learning opportunities to students who are physically isolated from their institution. This paper outlines the importance of information literacy, the major barriers faced by distance students and makes suggestions as to how institutions and their libraries can better meet their learning needs

Establishing a Relationship with Distant Learners: Can it be done? 

Disponible en français dans EDUQ.info sous le titre "Établir une relation pédagogique à distance... Est-ce possible?"In a distance-learning context, where, by definition, teaching and learning are isolated, what kinds of teacher-student relationships exist? What impact can such relationships have on education? The author explores the particular features of the educational relationship in an asynchronous distance-learning context, examining the former from a theoretical perspective and describing how it is manifested. Lastly, she discusses the implicit causal link that frequently exists between the teacher-student relationship and academic success

The development of accessibility indicators for distance learning programs

A study was undertaken to explore program policies and practices related to the accessibility of American distance learning courses to qualified students with disabilities. A literature review was conducted, a draft list of accessibility indicators was created, examples of applications of the indicators in existing distance learning programs were collected, the indicators were systematically applied to one distance learning program, input from a variety of distance learning programs was used to further refine the indicators, and these programs were encouraged to adopt the indicators and make use of resources provided by the project. Results of this exploratory work suggest that incorporating accessibility considerations into policies, procedures and communications of a program requires consideration of the unique needs of students, course designers, instructors and evaluators; involves approval and implementation at a variety of administrative levels; and is an ongoing process that may be implemented in incremental steps

Open educational resources in Europe: A triptych of actions to support participation in higher education

In contrast to the face-to-face learning of campus based universities and the focus on traditional students, distance teaching universities focus on a mix of distance learning, e-learning, open learning, virtual mobility, learning communities, and the integration of earning and learning. In doing so, they are taking a leading role in helping to increase and widen participation in lifelong open and flexible learning in higher education by non-traditional groups. This paper discusses three leading-edge European Open Educational Resource initiatives. The initiatives are special in nature and differ from the offers of traditional universities in the sense that they: consist of pedagogically-rich learning materials, specifically designed and developed for distance learning and intended for independent self-study; are compiled in the national languages, with the EADTU initiative being multilingual, reflecting the European dimension; and, support and are supported by the policies of the national governments and the European Commission