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Hands-On Neural Networks with Keras

You're reading from   Hands-On Neural Networks with Keras Design and create neural networks using deep learning and artificial intelligence principles

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Product type Paperback
Published in Mar 2019
Publisher Packt
ISBN-13 9781789536089
Length 462 pages
Edition 1st Edition
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Author (1):
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Niloy Purkait Niloy Purkait
Author Profile Icon Niloy Purkait
Niloy Purkait
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Table of Contents (16) Chapters Close

Preface 1. Section 1: Fundamentals of Neural Networks FREE CHAPTER
2. Overview of Neural Networks 3. A Deeper Dive into Neural Networks 4. Signal Processing - Data Analysis with Neural Networks 5. Section 2: Advanced Neural Network Architectures
6. Convolutional Neural Networks 7. Recurrent Neural Networks 8. Long Short-Term Memory Networks 9. Reinforcement Learning with Deep Q-Networks 10. Section 3: Hybrid Model Architecture
11. Autoencoders 12. Generative Networks 13. Section 4: Road Ahead
14. Contemplating Present and Future Developments 15. Other Books You May Enjoy

Checking model accuracy

As we saw previously, we achieved a test accuracy of 88% at the last epoch of our training session. Let's have a look at what this really means, by interpreting the precision and recall scores of our classifier:

As we noticed previously, the ratio of correctly predicted positive observations to the total number of positive observations in our test set (otherwise known as the precision score) is pretty high at 0.98. The recall score is a bit lower and denotes the number of correctly predicted results divided by the number of results that should have been returned. Finally, the F-measure simply combines both the precision and recall scores as a harmonic mean.

To supplement our understanding, we plot out a confusion matrix of our classifier on the test set, as shown as follows. This is essentially an error matrix that lets us visualize how our model...

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