November 2017
Intermediate to advanced
374 pages
10h 19m
English
Content preview from scikit-learn Cookbook , Second Edition - Second Edition
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Reading the confusion matrix
The small array of numbers has the following meaning:
The confusion matrix tells us a bit more about what occurred during classification, not only the accuracy score. The diagonal elements from upper-left to lower-right are correct classifications. There were 27 + 88 = 115 correct classifications. Off that diagonal, 27 + 12 = 39 mistakes were made in classification. Note that 115 / (115 + 39) yields the classifier accuracy again, of about 0.75.
Let us focus on the errors again. In the confusion matrix, 27 people were labelled as not having diabetes although they do. In a real-life context, this is a worse error ...
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