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Name: Adaboost example
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example: if an email has word “money” classify it as spam, Ada-Boost () was the first practical boosting algorithm (x) is a weak classifier, for example. Machine Learning Examples: ▫ Classification. ▫ Support Vector Machines (SVM), naive Bayes, LDA,. Decision trees, k-nearest neighbor, ANNs, AdaBoost. Ada-boost, like Random Forest Classifier is another ensemble classifier. update the weight of each training example with following formula.
A learning algorithm that can consistently generate such classifiers is called a weak learner. Is it possible to systematically boost the quality of a weak learner?. AdaBoost is an algorithm for constructing a ”strong” classifier as linear ( Discrete) AdaBoost Algorithm – Singer & Schapire () Demonstration example. Why the magic choice of? • Beyond scope of lecture. • A consequence: 50% of new weight mass Dj+1 assigned to examples misclassified by previous learner hj . This example fits an AdaBoosted decision stump on a non-linearly separable class label for each sample is determined by the sign of the decision score.