Book Image

Machine Learning with Swift

By : Jojo Moolayil, Alexander Sosnovshchenko, Oleksandr Baiev
Book Image

Machine Learning with Swift

By: Jojo Moolayil, Alexander Sosnovshchenko, Oleksandr Baiev

Overview of this book

Machine learning as a field promises to bring increased intelligence to the software by helping us learn and analyse information efficiently and discover certain patterns that humans cannot. This book will be your guide as you embark on an exciting journey in machine learning using the popular Swift language. We’ll start with machine learning basics in the first part of the book to develop a lasting intuition about fundamental machine learning concepts. We explore various supervised and unsupervised statistical learning techniques and how to implement them in Swift, while the third section walks you through deep learning techniques with the help of typical real-world cases. In the last section, we will dive into some hard core topics such as model compression, GPU acceleration and provide some recommendations to avoid common mistakes during machine learning application development. By the end of the book, you'll be able to develop intelligent applications written in Swift that can learn for themselves.
Table of Contents (18 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Pooling operation


Pooling or subsampling is a simple operation of input size decreasing (Figure 9.2). If you have a black and white image, and you want to decrease its size, you can do it in the following way: chose a sliding window of size × m and stride s. Go through the image, applying sliding window and shifting on the s pixels every time you want to move your window. At each position calculate an average (for average pooling) or maximum (for max pooling) and record this value into the destination matrix. Now, there are two common ways to handle borders of the image:

Figure 9.2. Pooling operation. Grey window in the source image corresponds to the grey cell in the destination image

The pooling is used in the CNNs to reduce the size of the data, as it travels down the network.