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 testing matrix


In this section, we will look at the testing matrix that we should consider in order to evaluate the trained ML models. For the baseline approach, we will be using the following five testing matrices:

  • Precision

  • Recall

  • F1-score

  • Support

  • Training accuracy

Before we understand these terms, let's cover some basic terms that will help us to understand the preceding terms.

  • True Positive (TP)—If the classifier predicts that the given movie review carries a positive sentiment and that movie review has a positive sentiment in an actual scenario, then these kinds of test cases are considered TP. So, you can define the TP as if the test result is one that detects the condition when the condition is actually present.

  • True Negative (TN)—If the classifier predicts that the given movie review carries a negative sentiment and that movie review has a negative sentiment in an actual scenario, then those kinds of test cases are considered True Negative(TN). So, you can define the...