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Hands-On Ensemble Learning with R

Hands-On Ensemble Learning with R

By : Tattar
3 (1)
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Hands-On Ensemble Learning with R

Hands-On Ensemble Learning with R

3 (1)
By: Tattar

Overview of this book

Ensemble techniques are used for combining two or more similar or dissimilar machine learning algorithms to create a stronger model. Such a model delivers superior prediction power and can give your datasets a boost in accuracy. Hands-On Ensemble Learning with R begins with the important statistical resampling methods. You will then walk through the central trilogy of ensemble techniques – bagging, random forest, and boosting – then you'll learn how they can be used to provide greater accuracy on large datasets using popular R packages. You will learn how to combine model predictions using different machine learning algorithms to build ensemble models. In addition to this, you will explore how to improve the performance of your ensemble models. By the end of this book, you will have learned how machine learning algorithms can be combined to reduce common problems and build simple efficient ensemble models with the help of real-world examples.
Table of Contents (15 chapters)
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12
12. What's Next?
13
A. Bibliography
14
Index

Summary

Boosting is yet another ramification of decision trees. It is a sequential iteration technique where the error from a previous iteration is targeted with more impunity. We began with the important adaptive boosting algorithm and used very simple toy data to illustrate the underpinnings. The approach was then extended to the regression problem and we illustrated the gradient boosting method with two different approaches. The two packages adabag and gbm were briefly elaborated on and the concept of variable importance was emphasized yet again. For the spam dataset, we got more accuracy with boosting and hence the deliberations of the boosting algorithm are especially more useful.

The chapter considered different variants of the boosting algorithm. However, we did not discuss why it works at all. In the next chapter, these aspects will be covered in more detail.

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