code: def get_default_distance(self):
      return SNRDistance()
  
imports: from ..distances import SNRDistance
  from ..utils import common_functions
  from .contrastive_loss import ContrastiveLoss
label_desc: Use image node_id 2 for calling the SignalToNoiseRatioContrastiveLoss obj's underlying member method code with example usage: obj.get_default_distance() and returns: SNRDistance