Exercise

Classify test data

You have a data object train_mod with an LDA model, and a document-term matrix test_dtm with data for the test cases. Now you can see how well (or how poorly) our classifier performs.

Instructions

100 XP

Obtain posterior probabilities for test documents using function posterior().
Probabilities of topics in documents are contained in the element $topics inside the result list. Display the matrix with topic probabilities.