Given the task definition and input, reply with output. You are given a paper review either in Spanish or English language. Based on the given review, evaluate the paper by classifying it to one of the five classes: (1) very negative, (2) negative, (3) neutral, (4) positive, and (5) very positive. Note that URLs in the text have been replaced with [Link].

Interesting application domain. Nothing new from a machine learning perspective. They authors should provide more information about the models they have obtained with the different classifiers (feature subset selection used, selected features, accuracies, statistical significance on the differences on accuracies, the models themselves, ...). Semi-supervised classification is the appropriate method for the last paragraph in the "Methodology" section.
positive