Book Image

Machine Learning with scikit-learn Quick Start Guide

By : Kevin Jolly
Book Image

Machine Learning with scikit-learn Quick Start Guide

By: Kevin Jolly

Overview of this book

Scikit-learn is a robust machine learning library for the Python programming language. It provides a set of supervised and unsupervised learning algorithms. This book is the easiest way to learn how to deploy, optimize, and evaluate all of the important machine learning algorithms that scikit-learn provides. This book teaches you how to use scikit-learn for machine learning. You will start by setting up and configuring your machine learning environment with scikit-learn. To put scikit-learn to use, you will learn how to implement various supervised and unsupervised machine learning models. You will learn classification, regression, and clustering techniques to work with different types of datasets and train your models. Finally, you will learn about an effective pipeline to help you build a machine learning project from scratch. By the end of this book, you will be confident in building your own machine learning models for accurate predictions.
Table of Contents (10 chapters)

Model optimization

The fundamental objective of the linear regression algorithm is to minimize the loss/cost function. In order to do this, the algorithm tries to optimize the values of the coefficients of each feature (Parameter1), such that the loss function is minimized.

Sometimes, this leads to overfitting, as the coefficients of each variable are optimized for the data that the variable is trained on. This means that your linear regression model will not generalize beyond your current training data very well.

The process by which we penalize hyper-optimized coefficients in order to prevent this type of overfitting is called regularization.

There are two broad types of regularization methods, as follows:

  • Ridge regression
  • Lasso regression

In the following subsections, the two types of regularization techniques will be discussed in detail, and you will learn about how...