It predicts the POS tags based on feature information of words collected in a predefined window size while ME or CRF predicts them based on the information of the whole sentence.
a confusion matrix for an n-way classification task is an n-by-n matrix, C, where the cell C (x: y) contains the number of times (in percentage) an item with correct classification x was classified by the model as y with respect to the total number of errors during the classification task.