PPT-Ensemble method, decision tree, random forest and boosting

Zhiqi Peng Key concepts of supervised learning Objective function is training loss measure how well model fit on training data is regularization measures complexity of model   Key concepts of supervised learning. Boosting, Bagging, Random Forests and More. Yisong Yue. Supervised Learning. Goal:. learn predictor h(x) . High accuracy (low error). Using training data {(x. 1. ,y. 1. ),…,(. x. n. ,y. n. )}. Person. Kalman. Filters. Yun Liu. Dept. of Atmospheric and Oceanic . Science, University of Maryland  . Atmospheric and oceanic . s. ciences and Center for Climatic . R. esearch, UW-Madison. Collaborators: X. . Decision Tree. Advantages. Fast and easy to implement, Simple to understand. Modular, Re-usable. Can be learned .  . can be constructed dynamically from observations and actions in game, we will discuss this further in a future topic called ‘Learning’). Lifeng. Yan. 1361158. 1. Ensemble of classifiers. Given a set . of . training . examples, . a learning algorithm outputs a . classifier which . is an hypothesis about the true . function f that generate label values y from input training samples x. Given . Better Predictions Through Diversity. Todd Holloway. ETech 2008. Outline. Building a classifier (a tutorial example). Neighbor method. Major ideas and challenges in classification. Ensembles in practice. Ludmila. . Kuncheva. School of Computer Science. Bangor University. mas00a@bangor.ac.uk. . Part 2. 1. Combiner. Features. Classifier 2. Classifier 1. Classifier L. …. Data set. A . . Combination level. Econ 404 – Jacob LaRiviere . –. Guest Lecture Brian Quistorff. May 10, 2017. Agenda. Review CART. Cross-Validation. How apply to heterogeneity. Problems. Causal Tree. Random Forests. Tree Benefits Intuition. nearest neighbor. Probabilistic models:. Naive Bayes. Logistic Regression. Linear models:. Perceptron. SVM. Decision models:. Decision Trees. Boosted Decision Trees. Random Forest. Outline: . a toolbox of useful algorithms concepts. Tandy Warnow. The University of Texas at Austin. Orangutan. Gorilla. Chimpanzee. Human. From the Tree of the Life Website,. University of Arizona. Phylogeny. (evolutionary tree). Applications. . of Phylogeny Estimation . Decision Tree. Advantages. Fast and easy to implement, Simple to understand. Modular, Re-usable. Can be learned .  . can be constructed dynamically from observations and actions in game, we will discuss this further in a future topic called ‘Learning’). Chong Ho (Alex) Yu. Problems of bias and variance. The bias is . the . error which results from missing a target. . For . example, if an estimated mean is 3, but the actual population value is 3.5, then the bias value is 0.5. . Decision Tree & Bootstrap Forest C. H. Alex Yu Park Ranger of National Bootstrap Forest What not regression? OLS regression is good for small-sample analysis. If you have an extremely large sample (e.g. Archival data), the power level may aproach 1 (.99999, but it cannot be 1). How is normal Decision Tree different from Random Forest?. A Decision Tree is a supervised learning strategy in machine learning. It may be used with both classification and regression algorithms. . As the name says, it resembles a tree with nodes. The branches are determined by the number of criteria. It separates data into these branches until a threshold unit is reached. . Pablo Aldama, Kristina . Vatcheva. , PhD. School of Mathematical & Statistical Sciences, University of Texas Rio Grande Val. ley. Data mining methods, such as decision trees, have become essential in healthcare for detecting fraud and abuse, physicians finding effective treatments for their patients, and patients receiving more affordable healthcare services (.