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

Building the Space Invaders gaming bot


We are going to build a gaming bot that can play Space Invaders. Most of you may have played this game or at least heard of it. If you haven't played it or you can't remember it at this moment, then take a look at the following screenshot:

Figure 11.12: Snippet of the Space Invaders game

Hopefully you remember the game now and how it was played. First, we will look at the concepts that we will be using to build this version of the gaming bot. Let's begin!

Understanding the key concepts

In this version of the gaming bot, we will be using the deep Q-network and training our bot. So before implementing this algorithm, we need to understand the concepts. Take a look at the following concepts:

  • Understanding a deep Q-network (DQN)

  • Understanding Experience Replay

Understanding a deep Q-network (DQN)

The deep Q-network algorithm is basically a combination of two concepts. It uses the Q-learning logic for a deep neural network. That is the reason why it is called a...