It is known that BLEU scores cannot be used for comparing two MT systems with different architectures (TectoMT and PBSMT in our case), but only for comparing different versions of the same system (either PBSMT or Tec-toMT in our case).
we focused on the results of the IT1+TERM experiments -which led to the best BLEU score for the TectoMT system, and the second best BLEU score for the PBSMT system (Table 2) -and performed human evaluation and in-depth error analysis in order to compare the performances of the TectoMT and PBSMT systems on the same datasets.