code: def create_metric(self):
      return sockeye.loss.LossMetric("test_metric")
  
file_path: sockeye/test/unit/test_loss.py
imports: import math
  import numpy
  import pytest
  import torch
  import sockeye.constants
  import sockeye.loss
  import sockeye.model
  import sockeye.utils
label_desc: Use image node_id 2 for calling the DummyLoss obj's underlying member method code with example usage: obj.create_metric() and returns: sockeye