class_docstr: This is an abstract base class.
  Don't inherit from unittest.TestCase, and don't name it 'Test*'.
  Do, however, do these things in classes which inherit from this.
code: def testDense(self):
      model, perfect_model, data, label = self._createDense()
      optimizer = self.build_optimizer(model)
      workspace.FeedBlob("data", data[0])
      workspace.FeedBlob("label", label[0])
      workspace.RunNetOnce(model.param_init_net)
      workspace.CreateNet(model.net, True)
      for _ in range(2000):
          idx = np.random.randint(data.shape[0])
          workspace.FeedBlob("data", data[idx])
          workspace.FeedBlob("label", label[idx])
          workspace.RunNet(model.net.Proto().name)
  
      np.testing.assert_allclose(
          perfect_model[np.newaxis, :],
          workspace.FetchBlob("fc_w"),
          atol=1e-2,
      )
      self.check_optimizer(optimizer)
  
file_path: pytorch/caffe2/python/optimizer_test_util.py
imports: import unittest
  import numpy
  from caffe2.python import brew, core, workspace, cnn, optimizer
  from caffe2.python.modeling.initializers import Initializer, PseudoFP16Initializer
  from caffe2.python.model_helper import ModelHelper
label_desc: Use image node_id 2 for calling the OptimizerTestBase obj's underlying member method code with example usage: obj.testDense() without return types