r/MachineLearning - [D] Active Learning with Human-in-the-Loop

I did a lot of research and can't find a satisfactory answer. I have just a quick question about Active Learning and would be pleased if you could answer it. I'm still wondering if active learning only fit for the training of a classifier? I know it can help to reduce the size of the training data while iteratively learning from an unlabeled data pool using human annotation. But all papers and literature I could found refer only to the training phase of classifiers. Is it also possible if the classifier is "live" and make some predictions to use the new observations to actively learn from them?