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Machine Learning Solutions

You're reading from   Machine Learning Solutions Expert techniques to tackle complex machine learning problems using Python

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788390040
Length 566 pages
Edition 1st Edition
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Author (1):
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Jalaj Thanaki Jalaj Thanaki
Author Profile Icon Jalaj Thanaki
Jalaj Thanaki
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Table of Contents (19) Chapters Close

Machine Learning Solutions
Foreword
Contributors
Preface
1. Credit Risk Modeling 2. Stock Market Price Prediction FREE CHAPTER 3. Customer Analytics 4. Recommendation Systems for E-Commerce 5. Sentiment Analysis 6. Job Recommendation Engine 7. Text Summarization 8. Developing Chatbots 9. Building a Real-Time Object Recognition App 10. Face Recognition and Face Emotion Recognition 11. Building Gaming Bot List of Cheat Sheets Strategy for Wining Hackathons Index

Testing the revised approach


In this section, we will perform testing of the revised approach. Before performing actual testing and seeing how good or bad the chatbot conversation is, we need to understand the basic testing metrics that we will be using for this approach and for the best approach. These testing metrics help us evaluate the model accuracy. Let's understand the testing metrics first, and then we will move on to the testing of the revised approach.

Understanding the testing metrics

In this section, we need to understand the following testing metrics:

  • Perplexity

  • Loss

Perplexity

In the NLP domain, perplexity is also referred to as per-word perplexity. Perplexity is a measurement of how well a trained model predicts the output for unseen data. It is also used to compare probability models. A low perplexity indicates that the probability distribution is good at predicting the sample. Even during training, you can see that for each checkpoint, perplexity is decreasing. Ideally, when there...

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