Sumários
Exercises on R
15 Novembro 2016, 15:00 • João Marques Silva
This week's practical covered the demos of classifiers in R, and classifiers using kNN and K-means.
Distance Models
15 Novembro 2016, 13:00 • João Marques Silva
This week's lecture focused on distance models. The first part of the lecture covered Minkowski's distance, and its relation with other well-known definitions of distance. In addition, we formalized the concepts of exemplars and neighbors, and centroids and medoids. The second part of the lecture covered k-nearest neighbors classification. Finally, the third part of the lecture covered clustering, defined scatter, described the K-means algorithm and variants, and investigated hierarchical clustering and its representation with dendrograms. For the different parts of the lecture, different examples were analyzed.
Quiz 1
8 Novembro 2016, 15:00 • João Marques Silva
This week's practical was the first quiz on the R programming language.
Overview of classification algorithms
8 Novembro 2016, 13:00 • João Marques Silva
This week's lecture focused on demonstrating different classification approaches, including decision trees, single and multilayer perceptrons and support vector machines, using R. The experimental setup was also analyzed, and its implementation in R was discussed. The lecture also covered support vector machines, their geometric interpretation, and outlined solution methods, that include quadratic constrained optimization and the use of Lagrangian multipliers. Finally, the lecture also analyzed the derivation of some results related with support vector machines.
Exercises on R
25 Outubro 2016, 15:00 • João Marques Silva
This week's practical covered a number of exercises with the R programming language. The main topic was training the perceptron and multilayer perceptron's.