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R Deep Learning Cookbook

R Deep Learning Cookbook

By : PKS Prakash, Sri Krishna Rao
1 (1)
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R Deep Learning Cookbook

R Deep Learning Cookbook

1 (1)
By: PKS Prakash, Sri Krishna Rao

Overview of this book

Deep Learning is the next big thing. It is a part of machine learning. It's favorable results in applications with huge and complex data is remarkable. Simultaneously, R programming language is very popular amongst the data miners and statisticians. This book will help you to get through the problems that you face during the execution of different tasks and Understand hacks in deep learning, neural networks, and advanced machine learning techniques. It will also take you through complex deep learning algorithms and various deep learning packages and libraries in R. It will be starting with different packages in Deep Learning to neural networks and structures. You will also encounter the applications in text mining and processing along with a comparison between CPU and GPU performance. By the end of the book, you will have a logical understanding of Deep learning and different deep learning packages to have the most appropriate solutions for your problems.
Table of Contents (11 chapters)
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Using functions to initialize weights and biases


Weights and biases form an integral part of any deep neural network optimization and here we define a couple of functions to automate these initializations. It is a good practice to initialize weights with small noise to break symmetry and prevent zero gradients. Additionally, a small positive initial bias would avoid inactivated neurons, suitable for ReLU activation neurons.

Getting ready

Weights and biases are model coefficients which need to be initialized before model compilation. This steps require the shape parameter to be determined based on input dataset.

How to do it...

  1. The following function is used to return randomly initialized weights:
# Weight Initialization
weight_variable <- function(shape) {
initial <- tf$truncated_normal(shape, stddev=0.1)
tf$Variable(initial)
}
  1. The following function is used to return constant biases:
bias_variable <- function(shape) {
initial <- tf$constant(0.1, shape=shape)
tf$Variable(initial)
}

How...

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R Deep Learning Cookbook
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