Artículos de revistas
ExplorerTree: A Focus+Context Exploration Approach for 2D Embeddings
Fecha
2021-07-15Registro en:
Big Data Research, v. 25.
2214-5796
10.1016/j.bdr.2021.100239
2-s2.0-85107938654
Autor
Universidade Estadual Paulista (UNESP)
Dalhousie University
Universidade de São Paulo (USP)
Institución
Resumen
In exploratory tasks involving high-dimensional datasets, dimensionality reduction (DR) techniques help analysts to discover patterns and other useful information. Although scatter plot representations of DR results allow for cluster identification and similarity analysis, such a visual metaphor presents problems when the number of instances of the dataset increases, resulting in cluttered visualizations. In this work, we propose a scatter plot-based multilevel approach to display DR results and address clutter-related problems when visualizing large datasets, together with the definition of a methodology to use focus+context interaction on non-hierarchical embeddings. The proposed technique, called ExplorerTree, uses a sampling selection technique on scatter plots to reduce visual clutter and guide users through exploratory tasks. We demonstrate ExplorerTree's effectiveness through a use case, where we visually explore activation images of the convolutional layers of a neural network. Finally, we also conducted a user experiment to evaluate ExplorerTree's ability to convey embedding structures using different sampling strategies.