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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 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

Convolutions and max layers


A great improvement in image classification has been achieved with the invention of the convolutional layers on the MNIST database:

While previous fully-connected layers perform a computation with all input values (pixels in the case of an image) of the input, a 2D convolution layer will consider only a small patch or window or receptive field of NxN pixels of the 2D input image for each output unit. The dimensions of the patch are named kernel dimensions, N is the kernel size, and the coefficients/parameters are the kernel.

At each position of the input image, the kernel produces a scalar, and all position values will lead to a matrix (2D tensor) called a feature map. Convolving the kernel on the input image as a sliding window creates a new output image. The stride of the kernel defines the number of pixels to shift the patch/window over the image: with a stride of 2, the convolution with the kernel is computed every 2 pixels.

For example, on a 224 x 224 input...

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