'synth_set' used twice

[fschmid56]

Hi, I was looking through the code for the DCASE'24 Task 4 baseline system and noticed the following lines in the file train_pretrained.py:

strong_full_set = torch.utils.data.ConcatDataset([strong_set, synth_set])
tot_train_data = [maestro_real_train, synth_set, strong_full_set, weak_set, unlabeled_set]
train_dataset = torch.utils.data.ConcatDataset(tot_train_data)

According to this, 'synth_set' is used twice. Is there a specific reason for this?