Book Image

Angular Services

By : Sohail Salehi
Book Image

Angular Services

By: Sohail Salehi

Overview of this book

A primary concern with modern day applications is that they need to be dynamic, and for that, data access from the server side, data authentication, and security are very important. Angular leverages its services to create such state-of-the-art dynamic applications. This book will help you create and design customized services, integrate them into your applications, import third-party plugins, and make your apps perform better and faster. This book starts with a basic rundown on how you can create your own Angular development environment compatible with v2 and v4. You will then use Bootstrap and Angular UI components to create pages. You will also understand how to use controllers to collect data and populate them into NG UIs. Later, you will then create a rating service to evaluate entries and assign a score to them. Next, you will create "cron jobs" in NG. We will then create a crawler service to find all relevant resources regarding a selected headline and generate reports on it. Finally, you will create a service to manage accuracy and provide feedback about troubled areas in the app created. This book is up to date for the 2.4 release and is compatible with the 4.0 release as well, and it does not have any code based on the beta or release candidates.
Table of Contents (15 chapters)
Angular Services
About the Author
About the Reviewer
Customer Feedback

Understanding the bag of words model

In this book, we are going to choose a popular machine learning model called the bag of words to represent a document. To give you a better idea about this concept, imagine that we take all the words in a document, throw them in a bag, shake them well, and take them out in no particular order. This new random document might not have a meaningful value to a human being, but to machines it has the same value as the original document. That's why we implemented all of those functions in our service so far.

Basically, when we demolish the grammar structure, it gives us freedom to focus more on the word instances, their weights, and how often they are repeated in the document. We will find out why and how we can benefit from this model in our application.

Imagine that we have applied this model on our original document, and there are two other documents out there. Now we want to find out which one of the other two samples has the highest similarity to our original...