code: def test_bias(self):
      callback = init.ZeroBias()
      mock = MagicMock()
      callback.initialiser(mock)
      self.assertTrue(mock.bias.data.zero_.call_count == 1)
  
file_path: torchbearer/tests/callbacks/test_init.py
imports: import torch
  from unittest import TestCase
  from mock import MagicMock, patch
  import torchbearer
  import torchbearer.callbacks.init
label_desc: Use image node_id 3 for calling the TestSimpleInits obj's underlying member method code with example usage: obj.test_bias() without return types