Sumários
Boosting
22 maio 2012, 17:00 • Mário Alexandre Teles de Figueiredo
Continuation of the study of the adaboost algorithm. Some theoretical properties (exponential decay of the empirical error).
Boosting
22 maio 2012, 15:00 • Mário Alexandre Teles de Figueiredo
Continuation of the study of the adaboost algorithm. Some theoretical properties (exponential decay of the empirical error).
Additive models
15 maio 2012, 17:00 • Mário Alexandre Teles de Figueiredo
Learning additive models. Backfitting and forward stagewise regression. Exponential loss and tha adaboost algorithm.
Additive models
15 maio 2012, 15:00 • Mário Alexandre Teles de Figueiredo
Learning additive models. Backfitting and forward stagewise regression. Exponential loss and tha adaboost algorithm.
Classification and Regression Trees
8 maio 2012, 17:00 • Mário Alexandre Teles de Figueiredo
Classification and regression trees. Basic definitions concerning trees (root, leaves, siblings, ancestors, descendants). Criteria for learning regression trees. Greedy tree growing and its computational complexity. Criteria for learning classification trees (Gini index, entropy, misclassification rate). Tree prunning.