Book Image

Deep Learning with R for Beginners

By : Mark Hodnett, Joshua F. Wiley, Yuxi (Hayden) Liu, Pablo Maldonado
Book Image

Deep Learning with R for Beginners

By: Mark Hodnett, Joshua F. Wiley, Yuxi (Hayden) Liu, Pablo Maldonado

Overview of this book

Deep learning has a range of practical applications in several domains, while R is the preferred language for designing and deploying deep learning models. This Learning Path introduces you to the basics of deep learning and even teaches you to build a neural network model from scratch. As you make your way through the chapters, you’ll explore deep learning libraries and understand how to create deep learning models for a variety of challenges, right from anomaly detection to recommendation systems. The Learning Path will then help you cover advanced topics, such as generative adversarial networks (GANs), transfer learning, and large-scale deep learning in the cloud, in addition to model optimization, overfitting, and data augmentation. Through real-world projects, you’ll also get up to speed with training convolutional neural networks (CNNs), recurrent neural networks (RNNs), and long short-term memory networks (LSTMs) in R. By the end of this Learning Path, you’ll be well-versed with deep learning and have the skills you need to implement a number of deep learning concepts in your research work or projects.
Table of Contents (23 chapters)
Title Page
Copyright and Credits
About Packt
Contributors
Preface
Index

Introduction to the TensorFlow library


TensorFlow is not just a deep learning library, but an expressive programming language that can implement various optimization and mathematical transformations on data. While it is mainly used to implement deep learning algorithms, it can perform much more. In TensorFlow, programs are represented as computational graphs, and data in TensorFlow is stored in tensors. A tensor is an array of data that has the same data type, and the rank of a tensor is the number of dimensions. Because all the data in a tensor must have the same type, they are more similar to R matrices than data frames.

 

 

Here is an example of tensors of various ranks:

library(tensorflow)

> # tensor of rank-0
> var1 <- tf$constant(0.1)
> print(var1)
Tensor("Const:0", shape=(), dtype=float32)

> sess <- tf$InteractiveSession()
T:\src\github\tensorflow\tensorflow\core\common_runtime\gpu\gpu_device.cc:1084] Created TensorFlow device (/job:localhost/replica:0/task:0/device...