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Confusion matrix
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Confusion matrix : ウィキペディア英語版
Confusion matrix

In the field of machine learning, a confusion matrix, also known as a contingency table or an error matrix
, is a specific table layout that allows visualization of the performance of an algorithm, typically a supervised learning one (in unsupervised learning it is usually called a matching matrix). Each column of the matrix represents the instances in a predicted class while each row represents the instances in an actual class (or vice-versa).〔 The name stems from the fact that it makes it easy to see if the system is confusing two classes (i.e. commonly mislabeling one as another).
== Example ==

If a classification system has been trained to distinguish between cats, dogs and rabbits, a confusion matrix will summarize the results of testing the algorithm for further inspection. Assuming a sample of 27 animals — 8 cats, 6 dogs, and 13 rabbits, the resulting confusion matrix could look like the table below:

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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