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Data Mining VS Visualization Santiago González Tortosa <[email protected]> Contents I. Data Mining VS Visualization II. Visualize to DM III. DM to Visualize (to DM) IV. Real world work: I. Global Behavior Modeling: A New approach to Grid autonomic management 2 Data Mining VS Visualization • Data Mining – Knowledge discovery and extration – Not always is easy to see patterns, distributions, etc. • Visualization – Represents data (2D, 3D, Virtual Reality,…) – Helps to extract patterns – Not always is easy to represent data in 2 or 3 dimensions 3 Visualize to DM • Visualization help us to extract any pattern in the data 4 Visualize to DM • Visualization help us to extract any pattern in the data 5 DM to Visualize • Data contains N (> 3) features – Curse of Dimensionality • We want to visualize all data • Dimensionality Reduction – Reduce number of features – Transform and create new features 6 DM to Visualize • Dimensionality Reduction – L.J.P. van der Maaten, E.O. Postma, and H.J. van den Herik. Dimensionality Reduction: A Comparative Review. Tilburg University Technical Report, TiCC-TR 2009-005, 2009 • Convex techniques: optimize an objective function that does not contain any local optima • Nonconvex techniques: optimize objective functions that do contain local optima 7 DM to Visualize • Optimization techniques (hill climbing, evolutive, etc.) 8 DM to Visualize • Optimization techniques – One objective – One objective with constraints (Semi-Supervised and labeling) – Multiobjective 9 DM to Visualize • Example: Optimize axis 10 DM to Visualize • Dimensionality Reduction in 2 phases: – FSS: Feature Subset Selection (wrapper, needed CLASS!) – Transformation and creation of new features (f.e. PCA) 11 DM to Visualize • Example of Dimensionality Reduction in 2 phases – User expert interacts 12 DM to Visualize • DM to Visualize….to DM!! • The idea is to obtain new knowledge or patterns viewing the data. – Supervised info: data with the same class are represented in the same area (KNN). – Unsupervised info: data is agrouped 13 DM to Visualize • Example that some data is agrouped 14 DM to Visualize • Visualization – 2D and 3D visualization – Virtual Reality • Inmersion • Interaction • Imagination – Augmented Reality 15 Real world work Global Behavior Modeling: A New approach to Grid autonomic management Jesus Montes <[email protected]> 16 Data Mining VS Visualization Santiago González Tortosa <[email protected]>