heartchallenge test set labels

[nstrodt]

Thank you for providing such a nice repository! I was recently looking into the heart sound challenge preprocessing. First, I was wondering where the test set labels in Challenge2_evaluation_sheet.xlsx come from. Second, I noticed some discrepancy between the unlabelled test samples and the entries in the xlsx file. Specifically 181_1308052613891_A is missing as wav file and there are no labels for 171_1307971016233_F and 181_1308052613891_C. How did you deal with this? Any hints are appreciated. Thanks a lot.