code: def test_top_ten_default(self):
      metric = torchbearer.metrics.get_default("top_10_acc").root
      self.assertEqual(metric.k, 10)
  
imports: import unittest
  import torch
  from torch.autograd import Variable
  import torchbearer
  from torchbearer.metrics import Loss, Epoch, CategoricalAccuracy, TopKCategoricalAccuracy, BinaryAccuracy, MeanSquaredError
label_desc: Use image node_id 5 for calling the TestTopKCategoricalAccuracy obj's underlying member method code with example usage: obj.test_top_ten_default() without return types