Book Image

Machine Learning Solutions

Book Image

Machine Learning Solutions

Overview of this book

Machine learning (ML) helps you find hidden insights from your data without the need for explicit programming. This book is your key to solving any kind of ML problem you might come across in your job. You’ll encounter a set of simple to complex problems while building ML models, and you'll not only resolve these problems, but you’ll also learn how to build projects based on each problem, with a practical approach and easy-to-follow examples. The book includes a wide range of applications: from analytics and NLP, to computer vision domains. Some of the applications you will be working on include stock price prediction, a recommendation engine, building a chat-bot, a facial expression recognition system, and many more. The problem examples we cover include identifying the right algorithm for your dataset and use cases, creating and labeling datasets, getting enough clean data to carry out processing, identifying outliers, overftting datasets, hyperparameter tuning, and more. Here, you'll also learn to make more timely and accurate predictions. In addition, you'll deal with more advanced use cases, such as building a gaming bot, building an extractive summarization tool for medical documents, and you'll also tackle the problems faced while building an ML model. By the end of this book, you'll be able to fine-tune your models as per your needs to deliver maximum productivity.
Table of Contents (19 chapters)
Machine Learning Solutions
Foreword
Contributors
Preface
Index

Understanding the concepts of face emotion recognition


We are using Convolutional Neural Network (CNN) to develop the FER application. Earlier, we looked at the basic architecture of CNN. In order to develop FER applications, we will be using the following CNN architecture and optimizer. We are building CNN that is two layers deep. We will be using two fully connected layers and the SoftMax function to categorize the facial emotions.

We will be using several layers made of the convolutional layer, followed by the ReLU (Rectified Linear Unit) layer, followed by the max pooling layer. Refer to the following diagram, which will help you conceptualize the arrangement of the CNN layers. Let's look at the working of CNN. We will cover the following layers:

  • The convolutional layer

  • The ReLU layer

  • The pooling layer

  • The fully connected layer

  • The SoftMax layer

Understanding the convolutional layer

In this layer, we will feed our image in the form of pixel values. We are using a sliding window of 3 x 3 dimension...