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Machine Learning Algorithms

Machine Learning Algorithms

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Machine Learning Algorithms

Machine Learning Algorithms

Overview of this book

Machine learning has gained tremendous popularity for its powerful and fast predictions with large datasets. However, the true forces behind its powerful output are the complex algorithms involving substantial statistical analysis that churn large datasets and generate substantial insight. This second edition of Machine Learning Algorithms walks you through prominent development outcomes that have taken place relating to machine learning algorithms, which constitute major contributions to the machine learning process and help you to strengthen and master statistical interpretation across the areas of supervised, semi-supervised, and reinforcement learning. Once the core concepts of an algorithm have been covered, you’ll explore real-world examples based on the most diffused libraries, such as scikit-learn, NLTK, TensorFlow, and Keras. You will discover new topics such as principal component analysis (PCA), independent component analysis (ICA), Bayesian regression, discriminant analysis, advanced clustering, and gaussian mixture. By the end of this book, you will have studied machine learning algorithms and be able to put them into production to make your machine learning applications more innovative.
Table of Contents (24 chapters)
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Title Page
Dedication
Packt Upsell
Contributors
Preface
Index

Independent Component Analysis


Sometimes, it's useful to process the data in order to extract components that are uncorrelated and independent. To better understand this scenario, let's suppose that we record two people while they sing different songs. The result is clearly very noisy, but we know that the stochastic signal could be decomposed into the following:

The first two terms are the single music sources (modeled as stochastic processes), while n(t) is additive Gaussian noise. Our goal is to find s1(t) + n1(t) and s2(t) + n1(t) in order to remove one of the two sources (with a part of the additive noise that cannot be filtered out). Performing this task using a standard PCA is very difficult because there are no constraints on the independence of the components. This problem has been widely studied by Hyvärinen and Oja (please refer to Independent Component Analysis: Algorithms and Applications, Hyvarinen A., Oja E., Neural Networks 13/2000), who considered the conditions that must...

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