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Deep Learning with Theano

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

Product type Paperback

Published in Jul 2017

Publisher Packt

ISBN-13 9781786465825

Length 300 pages

Edition 1st Edition

Tools

Theano

Concepts

Deep Learning

Author (1):

Christopher Bourez

View More author details

Table of Contents (15) Chapters

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

Encoding and embedding

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

Encoding and embedding

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 Encoding and embedding 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:

Encoding and embedding

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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Authors (1)

Bourez

Bourez

Christopher Bourez graduated from Ecole Polytechnique and Ecole Normale Suprieure de Cachan in Paris in 2005 with a Master of Science in Math, Machine Learning and Computer Vision (MVA). For 7 years, he led a company in computer vision that launched Pixee, a visual recognition application for iPhone in 2007, with the major movie theater brand, the city of Paris and the major ticket broker: with a snap of a picture, the user could get information about events, products, and access to purchase. While working on missions in computer vision with Caffe, TensorFlow or Torch, he helped other developers succeed by writing on a blog on computer science. One of his blog posts, a tutorial on the Caffe deep learning technology, has become the most successful tutorial on the web after the official Caffe website. On the initiative of Packt Publishing, the same recipes that made the success of his Caffe tutorial have been ported to write this book on Theano technology. In the meantime, a wide range of problems for Deep Learning are studied to gain more practice with Theano and its application.

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