Book Image

Data Science Algorithms in a Week

By : Dávid Natingga
Book Image

Data Science Algorithms in a Week

By: Dávid Natingga

Overview of this book

<p>Machine learning applications are highly automated and self-modifying, and they continue to improve over time with minimal human intervention as they learn with more data. To address the complex nature of various real-world data problems, specialized machine learning algorithms have been developed that solve these problems perfectly. Data science helps you gain new knowledge from existing data through algorithmic and statistical analysis.</p> <p>This book will address the problems related to accurate and efficient data classification and prediction. Over the course of 7 days, you will be introduced to seven algorithms, along with exercises that will help you learn different aspects of machine learning. You will see how to pre-cluster your data to optimize and classify it for large datasets. You will then find out how to predict data based on the existing trends in your datasets.</p> <p>This book covers algorithms such as: k-Nearest Neighbors, Naive Bayes, Decision Trees, Random Forest, k-Means, Regression, and Time-series. On completion of the book, you will understand which machine learning algorithm to pick for clustering, classification, or regression and which is best suited for your problem.</p>
Table of Contents (12 chapters)
11
Glossary of Algorithms and Methods in Data Science

Cross-validation

Cross-validation is a method to validate an estimated hypothesis on data. In the beginning of the analysis process, the data is split into the learning data and the testing data. A hypothesis is fit to the learning data, then its actual error is measured on the testing data. This way, we can estimate how well a hypothesis may perform on the future data. Reducing the amount of learning data can also be beneficial in the end, as it reduces the chance of hypothesis over-fitting – a hypothesis being trained to a particular narrow data subset of the data.

K-fold cross-validation

Original data is partitioned randomly into the k folds. 1 fold is used for the validation, k-1 folds of data are used for hypothesis...