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R Deep Learning Cookbook

You're reading from   R Deep Learning Cookbook Solve complex neural net problems with TensorFlow, H2O and MXNet

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Product type Paperback
Published in Aug 2017
Publisher Packt
ISBN-13 9781787121089
Length 288 pages
Edition 1st Edition
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Authors (2):
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Achyutuni Sri Krishna Rao Achyutuni Sri Krishna Rao
Author Profile Icon Achyutuni Sri Krishna Rao
Achyutuni Sri Krishna Rao
PKS Prakash PKS Prakash
Author Profile Icon PKS Prakash
PKS Prakash
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Toc

Table of Contents (11) Chapters Close

Preface 1. Getting Started FREE CHAPTER 2. Deep Learning with R 3. Convolution Neural Network 4. Data Representation Using Autoencoders 5. Generative Models in Deep Learning 6. Recurrent Neural Networks 7. Reinforcement Learning 8. Application of Deep Learning in Text Mining 9. Application of Deep Learning to Signal processing 10. Transfer Learning

Using functions to create a new convolution layer


The four-dimensional outcome of a newly created convolution layer is flattened to a two-dimensional layer such that it can be used as an input to a fully connected multilayered perceptron.

Getting ready

The recipe explains how to flatten a convolution layer before building the deep learning model. The input to the given function ( flatten_conv_layer) is a four-dimensional convolution layer that is defined based on previous layer.

How to do it...

  1. Run the following function to flatten the convolution layer:
flatten_conv_layer <- function(layer){
# Extract the shape of the input layer
layer_shape = layer$get_shape()
# Calculate the number of features as img_height * img_width * num_channels
num_features = prod(c(layer_shape$as_list()[[2]],layer_shape$as_list()[[3]],layer_shape$as_list()[[4]]))
# Reshape the layer to [num_images, num_features].
layer_flat = tf$reshape(layer, shape(-1, num_features))
# Return both the flattened layer and the number...
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