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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

Introduction to statistical learning concepts


Imagine that you need to design a spam-filtering algorithm, starting from this initial (over-simplistic) classification based on two parameters:

Parameter

Spam emails (X1)

Regular emails (X2)

p1 - Contains > 5 blacklisted words

80

20

p2 - Message length < 20 characters

75

25

 

We have collected 200 email messages (X) (for simplicity, we consider p1 and p2 as mutually exclusive) and we need to find a couple of probabilistic hypotheses (expressed in terms of p1 and p2), to determine the following:

We also assume the conditional independence of both terms (it means that hp1 and hp2 contribute in conjunction to spam in the same way as they would alone).

For example, we could think about rules (hypotheses) like so: "If there are more than five blacklisted words" or "If the message is less than 20 characters in length" then "the probability of spam is high" (for example, greater than 50%). However, without assigning probabilities, it's difficult to generalize...

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