# Confusion Matrix

## Definition of Confusion Matrix

Confusion Matrix: A confusion matrix is a table that is used to summarize the performance of a classification algorithm. The table shows how many times each class was predicted by the algorithm and how often each class was actually found in the data.

## What is a Confusion Matrix used for?

A Confusion Matrix is a powerful tool used in machine learning and data science to evaluate the accuracy of a model’s performance. It is a table that shows the number of correct and incorrect predictions made by the model during testing. The matrix allows us to see what types of errors were made, as well as how often they occurred. The rows and columns of the matrix correspond to the predicted classes and the actual classes, respectively. Each cell in the confusion matrix contains an integer representing the number of instances from each class that were correctly or incorrectly classified by our model.

An ideal confusion matrix will have all its entries on its diagonal for perfect classification, with zeroes everywhere else. In practice however, this is rarely true due to imperfections in our data or model errors. By examining which mistakes are being made most often, we can adjust our models accordingly and improve their accuracy over time. Furthermore, confusion matrices provide insight into which classes are more difficult for our models to classify accurately, allowing us to focus further efforts on those particular cases.

Overall, a confusion matrix helps us understand where our model succeeds and fails when making predictions so we can take measures to improve itâ€™s overall performance – making it an invaluable tool for any data scientist or machine learning engineer.