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Deep Learning with Theano

You're reading from   Deep Learning with Theano Perform large-scale numerical and scientific computations efficiently

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Product type Paperback
Published in Jul 2017
Publisher Packt
ISBN-13 9781786465825
Length 300 pages
Edition 1st Edition
Tools
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Author (1):
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Christopher Bourez Christopher Bourez
Author Profile Icon Christopher Bourez
Christopher Bourez
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Table of Contents (15) Chapters Close

Preface 1. Theano Basics 2. Classifying Handwritten Digits with a Feedforward Network FREE CHAPTER 3. Encoding Word into Vector 4. Generating Text with a Recurrent Neural Net 5. Analyzing Sentiment with a Bidirectional LSTM 6. Locating with Spatial Transformer Networks 7. Classifying Images with Residual Networks 8. Translating and Explaining with Encoding – decoding Networks 9. Selecting Relevant Inputs or Memories with the Mechanism of Attention 10. Predicting Times Sequences with Advanced RNN 11. Learning from the Environment with Reinforcement 12. Learning Features with Unsupervised Generative Networks 13. Extending Deep Learning with Theano Index

Simple recurrent network

An RNN is a network applied at multiple time steps but with a major difference: a connection to the previous state of layers at previous time steps named hidden states Simple recurrent network:

Simple recurrent network

This can be written in the following form:

Simple recurrent network
Simple recurrent network

An RNN can be unrolled as a feedforward network applied on the sequence Simple recurrent network as input and with shared parameters between different time steps.

Input and output's first dimension is time, while next dimensions are for the data dimension inside each step. As seen in the previous chapter, the value at a time step (a word or a character) can be represented either by an index (an integer, 0-dimensional) or a one-hot-encoding vector (1-dimensional). The former representation is more compact in memory. In this case, input and output sequences will be 1-dimensional represented by a vector, with one dimension, the time:

x = T.ivector()
y = T.ivector()

The structure of the training program remains the same as in Chapter 2, Classifying Handwritten Digits with a Feedforward...

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