The directory should contain three files corresponding to the train, trial, and test parts of SICK.

$ wc -l SICK_dataset/SICK_t*
   4928 SICK_dataset/SICK_test_annotated.txt
   4501 SICK_dataset/SICK_train.txt
    501 SICK_dataset/SICK_trial.txt
   9930 total

These files can be obtained from the SemEval-14 task 1:

• TRIAL DATA,
• TRAINING DATA,
• TEST DATA (including gold scores)

Note that files obtained from the original SICK page contain fewer problems than the one distributed via the SemEval task