Introduction - If you have any usage issues, please Google them yourself
It is the corresponding testing
module of the function that is specified in the training phase.
test_set is a NxD matrix where N is the number of samples
in the test set and D is the dimension of the feature space.
true_labels is a Nx1 matrix specifying the class label of
each corresponding sample s features (each row) in test_set .
adaboost_model is the model that is generated by the function
ADABOOST_tr .