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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
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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 FREE CHAPTER 2. Classifying Handwritten Digits with a Feedforward Network 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

Encoding and embedding


Each word can be represented by an index in a vocabulary:

Encoding words is the process of representing each word as a vector. The simplest method of encoding words is called one-hot or 1-of-K vector representation. In this method, each word is represented as an vector with all 0s and one 1 at the index of that word in the sorted vocabulary. In this notation, |V| is the size of the vocabulary. Word vectors in this type of encoding for vocabulary {King, Queen, Man, Woman, Child} appear as in the following example of encoding for the word Queen:

In the one-hot vector representation method, every word is equidistant from the other. However, it fails to preserve any relationship between them and leads to data sparsity. Using word embedding does overcome some of these drawbacks.

Word embedding is an approach to distributional semantics that represents words as vectors of real numbers. Such representation has useful clustering properties, since it groups together words that...

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