Hands-On Image Processing with Python

Computing the posterior probabilities to make predictions on test data and model evaluation

In order to predict the label of a new image, x, we need to find the label, j, for which the posterior probability, Pr(y=j|x), is maximum. It can be computed using the Bayes rule, as follows:

The following code block shows how to predict the labels of the test dataset using the generative model and how to compute the number of errors the model makes on the test dataset. As can be seen, the accuracy of the test dataset is 95.6%, which is a little less than the 1-NN classifier:

# Compute log Pr(label|image) for each [test image,label] pair.k = 10score ...