February 2018
Beginner to intermediate
258 pages
5h 47m
English
Content preview from R Deep Learning Projects
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From unstructured text data to a matrix
An issue with text data is that words and sentences are messy, and algorithms for data mining usually do not work out of the box, as they are designed to operate on abstractions of the data, usually in matrix form. So we need to find a way to represent our messy text data as a matrix.
One of the most commonly used matrix representations in practice is the bag of words model. This is a very simple and intuitive way of extracting information from text. There are some caveats to it, which will be discussed later.
A bag of words representation of a text consists of:
- A vocabulary of known words
- A numerical measure associated to the presence of such words
For example, suppose we have a corpus (a collection ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.