code: def _sub_loss_names(self):
      return ["margin_loss", "beta_reg_loss"]
  
file_path: pytorch-metric-learning/src/pytorch_metric_learning/losses/margin_loss.py
imports: import torch
  from ..reducers import DivisorReducer
  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 MarginLoss obj's underlying member method code with example usage: obj._sub_loss_names() and returns: list