For the three monolingual baseline methods (BaseCN1, BaseCN2, and BaseCN3), the BaseCN2 and BaseCN3 methods outperform the BaseCN1 method.
the BaseCN2 and BaseCN3 methods cannot outperform the strong cross-lingual baseline methods (e.g., TSVM(ENCN), SelfTrain(ENCN)), because the Chinese training corpus is automatically collected without human checking and thus about 10% of the reviews are mistakenly labeled.