Book Image

Deep Learning with TensorFlow and Keras – 3rd edition - Third Edition

By : Amita Kapoor, Antonio Gulli, Sujit Pal
5 (2)
Book Image

Deep Learning with TensorFlow and Keras – 3rd edition - Third Edition

5 (2)
By: Amita Kapoor, Antonio Gulli, Sujit Pal

Overview of this book

Deep Learning with TensorFlow and Keras teaches you neural networks and deep learning techniques using TensorFlow (TF) and Keras. You'll learn how to write deep learning applications in the most powerful, popular, and scalable machine learning stack available. TensorFlow 2.x focuses on simplicity and ease of use, with updates like eager execution, intuitive higher-level APIs based on Keras, and flexible model building on any platform. This book uses the latest TF 2.0 features and libraries to present an overview of supervised and unsupervised machine learning models and provides a comprehensive analysis of deep learning and reinforcement learning models using practical examples for the cloud, mobile, and large production environments. This book also shows you how to create neural networks with TensorFlow, runs through popular algorithms (regression, convolutional neural networks (CNNs), transformers, generative adversarial networks (GANs), recurrent neural networks (RNNs), natural language processing (NLP), and graph neural networks (GNNs)), covers working example apps, and then dives into TF in production, TF mobile, and TensorFlow with AutoML.
Table of Contents (23 chapters)
21
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22
Index

Perceptron

The “perceptron” is a simple algorithm that, given an input vector x of m values (x1, x2,..., and xm), often called input features or simply features, outputs either a 1 (“yes”) or a 0 (“no”). Mathematically, we define a function:

Where w is a vector of weights, is the dot product , and b is the bias. If you remember elementary geometry, wx + b defines a boundary hyperplane that changes position according to the values assigned to w and b. Note that a hyperplane is a subspace whose dimension is one fewer than that of its ambient space. See (Figure 1.2) for an example:

Figure 1.2: An example of a hyperplane

In other words, this is a very simple but effective algorithm! For example, given three input features, the amounts of red, green, and blue in a color, the perceptron could try to decide whether the color is “white” or not.

Note that the perceptron cannot express a “maybe”...