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Scala for Machine Learning

You're reading from  Scala for Machine Learning

Product type Book
Published in Dec 2014
Publisher
ISBN-13 9781783558742
Pages 624 pages
Edition 1st Edition
Languages
Author (1):
Patrick R. Nicolas Patrick R. Nicolas
Profile icon Patrick R. Nicolas
Toc

Table of Contents (20) Chapters close

Scala for Machine Learning
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Getting Started 2. Hello World! 3. Data Preprocessing 4. Unsupervised Learning 5. Naïve Bayes Classifiers 6. Regression and Regularization 7. Sequential Data Models 8. Kernel Models and Support Vector Machines 9. Artificial Neural Networks 10. Genetic Algorithms 11. Reinforcement Learning 12. Scalable Frameworks Basic Concepts Index

Evaluation


Before applying our multilayer perceptron to understand fluctuations in the currency market exchanges, let's get acquainted with some of the key learning parameters introduced in the first section.

The execution profile

Let's take a look at the convergence of the training of the multiple layer perceptron. The monitor trait (refer to the Monitor section under Utility classes in the Appendix A, Basic Concepts) collects and displays some execution parameters. We select to extract the profile for the convergence of the multiple layer perceptron using the difference of the backpropagation errors between two consecutive episodes (or epochs).

The test profiles the convergence of the MLP using a learning rate of η = 0.03 and a momentum factor of α = 0.3 for a multilayer perceptron with two input values: one hidden layer with three nodes and one output value. The test relies on synthetically generated random values:

The execution profile for the cumulative error for MLP

Impact of the learning...

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