Figure 1 shows a visualization of the Naive-Bayes classifier for Fisher’s Iris data set, where the task is to determine the type of iris based on four attributes. Each bar represents evidence for a given class and attribute value. Users can immediately see that all values for petal-width and petal length are excellent determiners, while the middle range (2.95-3.35) for sepalwidth
adds little evidence in favor of one class or another.