Análise de algoritmos de construção de grafos em conjuntos de dados de alta dimensionalidade

• Autor(a) principal: Soares, Vitor Freitas Xavier
• Data de Publicação: 2023
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UFSCAR
• Texto Completo: https://repositorio.ufscar.br/handle/ufscar/18517
• topic: Aprendizado da áquina; Algoritmos de agrupamento; Construção de grafos; Detecção de comunidade; Maldição da dimensionalidade; Machine learning; Graph construction; Clustering algorithms; Community detection; CIENCIAS EXATAS E DA TERRA::CIENCIA DA COMPUTACAO::METODOLOGIA E TECNICAS DA COMPUTACAO

The rapid development and adoption of information technologies, such as the internet, have resulted in an explosion in data generation, significantly increasing the volume of new instances with various attributes. The vast number of attributes present in certain datasets does not necessarily imply better performance, as algorithm performance decreases as attributes are excessively added (Curse of Dimensionality). Therefore, in the field of machine learning, traditional clustering algorithms play a crucial role in analyzing such data by segmenting it based on similarities. A more recent approach involves associating graph construction algorithms with community detection algorithms. In this approach, graphs represent the relationships between the data, while community detection algorithms are responsible for revealing densely connected groups and identifying hidden patterns. In light of this, the aim of this study is to perform an analysis of graph construction algorithms combined with community detection on high-dimensional datasets. Synthetic datasets were used, with the primary evaluation metric being the normalized mutual information index (NMI). Additionally, datasets with different numbers of attributes, groups, samples, and overlap were evaluated to observe the effects of dimensionality on the results. Traditional clustering algorithms, such as K-means and Agglomerative Clustering, were considered as baselines for comparing the performance of others. The results indicated that graph construction algorithms combined with community detection algorithms are a viable alternative and even yield better results in some cases than traditional clustering algorithms for high-dimensional datasets.