Book Image

Applied Supervised Learning with R

By : Karthik Ramasubramanian, Jojo Moolayil
Book Image

Applied Supervised Learning with R

By: Karthik Ramasubramanian, Jojo Moolayil

Overview of this book

R provides excellent visualization features that are essential for exploring data before using it in automated learning. Applied Supervised Learning with R helps you cover the complete process of employing R to develop applications using supervised machine learning algorithms for your business needs. The book starts by helping you develop your analytical thinking to create a problem statement using business inputs and domain research. You will then learn different evaluation metrics that compare various algorithms, and later progress to using these metrics to select the best algorithm for your problem. After finalizing the algorithm you want to use, you will study the hyperparameter optimization technique to fine-tune your set of optimal parameters. The book demonstrates how you can add different regularization terms to avoid overfitting your model. By the end of this book, you will have gained the advanced skills you need for modeling a supervised machine learning algorithm that precisely fulfills your business needs.
Table of Contents (12 chapters)
Applied Supervised Learning with R
Preface

Implementing Multilabel Classifier Using the mlr and OpenML Packages


We will now see how to train a multilabel classifier using the mlr and OpenML packages. First, we will download the scene dataset from OpenML.

Exercise 102: Downloading the Scene Dataset from OpenML

In this exercise, we will download the scene dataset and set it up for further analysis.

Perform the following steps to complete the exercise:

  1. In order to download the scene dataset through OpenML API, first create an account in the OpenML website at https://www.openml.org/register. The registration process involves verifying your email address, post which you will get the access to the API keys.

    Figure 9.8: The OpenML registration page.

  2. After logging in to your account, navigate to your account and select the API AUTHENTICATION option.

  3. On the API Authentication page, select and copy-paste the API key from the API key section. The authors of the Multilabel Classification with R Package mlr paper uploaded a bunch of datasets with a...