code: def get_default_reducer(self):
      return AvgNonZeroReducer()
  
file_path: pytorch-metric-learning/src/pytorch_metric_learning/losses/contrastive_loss.py
imports: import torch
  from ..reducers import AvgNonZeroReducer
  from ..utils import loss_and_miner_utils
  from .generic_pair_loss import GenericPairLoss
label_desc: Use image node_id 6 for calling the ContrastiveLoss obj's underlying member method code with example usage: obj.get_default_reducer() and returns: AvgNonZeroReducer