Book Image

Python Deep Learning Cookbook

By : Indra den Bakker
Book Image

Python Deep Learning Cookbook

By: Indra den Bakker

Overview of this book

Deep Learning is revolutionizing a wide range of industries. For many applications, deep learning has proven to outperform humans by making faster and more accurate predictions. This book provides a top-down and bottom-up approach to demonstrate deep learning solutions to real-world problems in different areas. These applications include Computer Vision, Natural Language Processing, Time Series, and Robotics. The Python Deep Learning Cookbook presents technical solutions to the issues presented, along with a detailed explanation of the solutions. Furthermore, a discussion on corresponding pros and cons of implementing the proposed solution using one of the popular frameworks like TensorFlow, PyTorch, Keras and CNTK is provided. The book includes recipes that are related to the basic concepts of neural networks. All techniques s, as well as classical networks topologies. The main purpose of this book is to provide Python programmers a detailed list of recipes to apply deep learning to common and not-so-common scenarios.
Table of Contents (21 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback

Tuning the loss function

While training a neural network for a learning problem, the objective of the network is to minimize the loss function. The loss function — also known as error, cost function, or opimization function–compares the prediction with the ground truth during the forward pass. The output of this loss function is used to optimize the weights during the backward pass. Therefore, the loss function is crucial in training the network. By setting the correct loss function, we force the network to optimize towards the desired predictions. For example, for imbalanced datasets we need a different loss function.

In the previous recipes, we've used mean squared error (MSE) and categorical entropy as loss functions. There are also other popular loss functions, and another option is to create a custom loss function. A custom loss function gives the ability to optimize to the desired output. This will be important when we will implement Generative Adversarial Networks (GANs). In the...