Task: Question Understanding
Input (English): Three baseline classification methods: Support Vector Machines (SVM), Adaboost, and Random Forests are adopted to evaluate our extracted features. On each dataset, the employed classifiers are trained with individual feature first, and then with the combination of the two features. 
 Question: LDA is an unsupervised method; is this paper introducing an unsupervised approach to spam detection?
Output (English): Yes-no