As can be seen in Tables 1 through 8, no matter which machine translation service is used, the proposed co-training approach (CoTrain) outperforms all baseline methods on the overall accuracy metric and most other metrics on the two test sets.
on the IT168 test set, the best accuracy is achieved by CoTrain with GoogleTranslate, and on the 360BUY test set, the best result is achieved by CoTrain with YahooTranslate.