src/transformers/models/deformable_detr/modeling_deformable_detr.py/DeformableDetrLoss/__init__
class DeformableDetrLoss:    def __init__(self, matcher, num_classes, focal_alpha, losses):
        super().__init__()
        self.matcher = matcher
        self.num_classes = num_classes
        self.focal_alpha = focal_alpha
        self.losses = losses