code: def test_shannonentropy(self):
      name = "shannonentropy"
      Metric = metrics_dict[name](config)
      self.assertEqual(
          Metric.get_entropy(item_matrix),
          -np.mean(
              [
                  1 / 15 * np.log(1 / 15),
                  2 / 15 * np.log(2 / 15),
                  3 / 15 * np.log(3 / 15),
                  2 / 15 * np.log(2 / 15),
                  4 / 15 * np.log(4 / 15),
                  1 / 15 * np.log(1 / 15),
                  2 / 15 * np.log(2 / 15),
              ]
          ),
      )
  
file_path: RecBole/tests/metrics/test_topk_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 10 for calling the TestTopKMetrics obj's underlying member method code with example usage: obj.test_shannonentropy() without return types