executed ./fast learnbpe 2000 ../../CORPUS/train_data/train.en ../../CORPUS/train_data/train.te ../../CORPUS/train_data/en_te_codes

Error:
fast: fastBPE/main.cc:30: int main(int, char**): Assertion `argc == 4 || argc == 5' failed.
Aborted (core dumped)