code: def get_default_distance(self):
      return LpDistance(power=2)
  
file_path: pytorch-metric-learning/src/pytorch_metric_learning/losses/nca_loss.py
imports: import torch
  from ..distances import LpDistance
  from ..utils import common_functions
  from ..utils import loss_and_miner_utils
  from .base_metric_loss_function import BaseMetricLossFunction
label_desc: Use image node_id 4 for calling the NCALoss obj's underlying member method code with example usage: obj.get_default_distance() and returns: LpDistance