code: def test_mae(self):
      name = "mae"
      self.assertEqual(
          get_result(name, case=0), (0.9 + 0.9 + 0.8 + 0.7) / 4
      )
      self.assertEqual(
          get_result(name, case=1), (0.7 + 0.5 + 0.4 + 0.2) / 4
      )
  
file_path: RecBole/tests/metrics/test_loss_metrics.py
imports: import os
  import sys
  import unittest
  import numpy
  from recbole.config import Config
  from recbole.evaluator.register import metrics_dict
label_desc: Use image node_id 4 for calling the TestLossMetrics obj's underlying member method code with example usage: obj.test_mae() without return types