code: def _get_config(self):
      return {
          "name": "sum_arbitrary",
          "weights": [1.0, 1.0, 1.0],
          "losses": [
              {"name": "mock_a"},
              {"name": "mock_b"},
              {"name": "mock_c"},
          ],
      }
  
imports: import copy
  import unittest
  import torch
  from classy_vision.losses import build_loss, ClassyLoss, register_loss, SumArbitraryLoss
label_desc: Use image node_id 1 for calling the TestSumArbitraryLoss obj's underlying member method code with example usage: obj._get_config() and returns: dict