mdd loss relies on labels ?

[LindgeW]

mdd-domain-adaptation/mdd/loss.py

Line 8 in 345af1d

def mdd_loss(features, labels, left_weight=1, right_weight=1):

It seems that the calculation of the mdd loss relies on labels. Doesn't this restrict its application? You know, most distance functions (e.g., MMD, CORAL) just require the features of source and target domain for calculation.