What's the difference between BCEcls and BCEobj?

[ShirleyHe2020]

class ComputeLoss:
# Compute losses
def init(self, model, autobalance=False):
super(ComputeLoss, self).init()
device = next(model.parameters()).device # get model device
h = model.hyp # hyperparameters

    # Define criteria
    BCEcls = nn.BCEWithLogitsLoss(pos_weight=torch.tensor([h['cls_pw']], device=device))
    BCEobj = nn.BCEWithLogitsLoss(pos_weight=torch.tensor([h['obj_pw']], device=device))

[Bobo-y]

BCEobj for object or background, when there is a object, BCEcls for object's class. You can review Yolo's design.