Book Image

R Deep Learning Projects

Book Image

R Deep Learning Projects

Overview of this book

R is a popular programming language used by statisticians and mathematicians for statistical analysis, and is popularly used for deep learning. Deep Learning, as we all know, is one of the trending topics today, and is finding practical applications in a lot of domains. This book demonstrates end-to-end implementations of five real-world projects on popular topics in deep learning such as handwritten digit recognition, traffic light detection, fraud detection, text generation, and sentiment analysis. You'll learn how to train effective neural networks in R—including convolutional neural networks, recurrent neural networks, and LSTMs—and apply them in practical scenarios. The book also highlights how neural networks can be trained using GPU capabilities. You will use popular R libraries and packages—such as MXNetR, H2O, deepnet, and more—to implement the projects. By the end of this book, you will have a better understanding of deep learning concepts and techniques and how to use them in a practical setting.
Table of Contents (11 chapters)

Warm-up – data exploration


Let's get things moving with a tiny example. Let's look at this tiny reviews corpus:

text <- c("The food is typical Czech, and the beer is good. The service is quick, if short and blunt, and the waiting on staff could do with a bit of customer service training",
          "The food was okay. Really not bad, but we had better",
          "A venue full of locals. No nonsense, no gimmicks. Only went for drinks which were good and cheap. People friendly enough.",
          "Great food, lovely staff, very reasonable prices considering the location!")

We will do some simple analysis here, which will help us appreciate some of the subtleties of sentiment analysis.

Working with tidy text

For this, we will use the tidytext package. This package is built on the philosophy of tidy data, introduced by Hadley Wickham in his 2014 paper (https://www.jstatsoft.org/article/view/v059i10). A dataset is tidy if the following three conditions are satisfied:

  • Each variable is a column
  • Each...