Book Image

Applied Deep Learning with Keras

By : Ritesh Bhagwat, Mahla Abdolahnejad, Matthew Moocarme
Book Image

Applied Deep Learning with Keras

By: Ritesh Bhagwat, Mahla Abdolahnejad, Matthew Moocarme

Overview of this book

Though designing neural networks is a sought-after skill, it is not easy to master. With Keras, you can apply complex machine learning algorithms with minimum code. Applied Deep Learning with Keras starts by taking you through the basics of machine learning and Python all the way to gaining an in-depth understanding of applying Keras to develop efficient deep learning solutions. To help you grasp the difference between machine and deep learning, the book guides you on how to build a logistic regression model, first with scikit-learn and then with Keras. You will delve into Keras and its many models by creating prediction models for various real-world scenarios, such as disease prediction and customer churning. You’ll gain knowledge on how to evaluate, optimize, and improve your models to achieve maximum information. Next, you’ll learn to evaluate your model by cross-validating it using Keras Wrapper and scikit-learn. Following this, you’ll proceed to understand how to apply L1, L2, and dropout regularization techniques to improve the accuracy of your model. To help maintain accuracy, you’ll get to grips with applying techniques including null accuracy, precision, and AUC-ROC score techniques for fine tuning your model. By the end of this book, you will have the skills you need to use Keras when building high-level deep neural networks.
Table of Contents (12 chapters)
Applied Deep Learning with Keras
Preface
Preface

Model Selection with Cross-validation


Cross-validation provides us with a robust estimation of model performance on unseen examples. For this reason, it can be used to decide between two models for a particular problem or to decide which model parameters (or hyperparameters) to use for a particular problem. In these cases, we would like to find out which model or which set of model parameters/hyperparameters results in the lowest test error rate. Therefore, we will select that model or that set of parameters/hyperparameters for our problem.

In this section, you are going to practice using cross-validation for this purpose. You will learn how to define a set of hyperparameters for your deep learning model and then write user-defined functions in order to perform cross-validation on your model for each of the possible combinations of hyperparameters. You will then observe which combination of hyperparameters leads to the lowest test error rate, and that combination will be your choice for your...