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Authors: Lombardo, Gianfranco | Poggi, Agostino

Article Type: Research Article

Abstract:  The application of Machine Learning techniques over networks, such as prediction tasks over nodes and edges, is becoming often crucial in the analysis of Complex systems in a wide range of research fields. One of the enabling technologies in that sense is represented by Node Embedding, which enables us to learn features automatically over the network. Among the different approaches proposed in the literature, the most promising are DeepWalk and Node2Vec, where the embedding is computed by combining random walks and neural language models. However, characteristic limitations with these techniques are related to memory requirements and time complexity. In this …paper, we propose a distributed and scalable solution, named ActorNode2vec, that keeps the best advantages of Node2Vec and overcomes the limitations with the adoption of the actor model to distribute the computational load. We demonstrate the efficacy of this approach with a large network by analyzing the sensitivity of walk length and number of walks parameters and make a comparison also with Deep walk and an Apache Spark distributed implementation of Node2Vec. Results show that with ActorNode2vec computational times are drastically reduced without losing embedding quality and overcoming memory issues. Show more

Keywords: Network science, embedding, node embedding, Node2vec, actodes, distributed systems, data mining, complex systems, actor model

DOI: 10.3233/IA-190038

Citation: Intelligenza Artificiale, vol. 14, no. 1, pp. 103-114, 2020

Authors: Bergenti, Federico | Iotti, Eleonora | Poggi, Agostino

Article Type: Research Article

Abstract: This paper presents the key aspects of a proposed formalization of JADE agents and multi-agent systems based on transition systems. Such a formalization is meant to be useful to describe and clarify how JADE multi-agent systems work and to provide a theoretical instrument to validate and analyze the semantics of JADE agents. This is needed to decouple agent-oriented and object-oriented parts of an agent design and to avoid misunderstandings on the semantics of JADE agents. The chosen approach is to define a structural operational semantics for Java programs written using JADE, and the proposed formalization consists in two parts: the …first identifies and defines the main entities that together compose a JADE multi-agent system; the second provides the transition system and rewriting rules. The paper terminates with two explanatory examples of the usage of the transition system. A brief recapitulation of the work concludes the paper. Show more

Keywords: JADE, transition systems, formal semantics

DOI: 10.3233/IA-150085

Citation: Intelligenza Artificiale, vol. 9, no. 2, pp. 149-161, 2015