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Hands-On Machine Learning with scikit-learn and Scientific Python Toolkits

You're reading from   Hands-On Machine Learning with scikit-learn and Scientific Python Toolkits A practical guide to implementing supervised and unsupervised machine learning algorithms in Python

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Product type Paperback
Published in Jul 2020
Publisher Packt
ISBN-13 9781838826048
Length 384 pages
Edition 1st Edition
Languages
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Author (1):
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Tarek Amr Tarek Amr
Author Profile Icon Tarek Amr
Tarek Amr
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Table of Contents (18) Chapters Close

Preface 1. Section 1: Supervised Learning
2. Introduction to Machine Learning FREE CHAPTER 3. Making Decisions with Trees 4. Making Decisions with Linear Equations 5. Preparing Your Data 6. Image Processing with Nearest Neighbors 7. Classifying Text Using Naive Bayes 8. Section 2: Advanced Supervised Learning
9. Neural Networks – Here Comes Deep Learning 10. Ensembles – When One Model Is Not Enough 11. The Y is as Important as the X 12. Imbalanced Learning – Not Even 1% Win the Lottery 13. Section 3: Unsupervised Learning and More
14. Clustering – Making Sense of Unlabeled Data 15. Anomaly Detection – Finding Outliers in Data 16. Recommender System – Getting to Know Their Taste 17. Other Books You May Enjoy

DBSCAN

"You never really understand a person until you consider things from his point of view."
- Harper Lee

The acronym DBSCAN stands for density-based spatial clustering of applications with noise. It sees clusters as areas of high density separated by areas of low density. This allows it to deal with clusters of any shape. This is in contrast to the K-means algorithm, which assumes clusters to be convex; that is, data blobs with centroids. The DBSCANalgorithm starts by identifying the core samples. These are points that have at least min_samples around them within a distance of eps (ε). Initially, a cluster is built out of its core samples. Once a core sample has been identified, its neighbors are also examined and added to the cluster if they meet the core sample criteria. Then, the cluster is expanded so that we can add non-core samples to it. These are samples that can be reached directly from the core samples within a distance...

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