code: def test_unsqueeze_2D(self):
      data = np.random.randn(2, 3)
      parameter = Parameter(shape=(2, 3), init_weight=data)
      out = autograd.expand_dims(parameter, axis=0)
      model = Model(input=parameter, output=out)
      result = model.forward(data)
      np.testing.assert_almost_equal(
          result, np.expand_dims(data, axis=0), decimal=5
      )
  
imports: import keras.backend
  import keras.layers
  import numpy
  import pytest
  from test.zoo.pipeline.utils.test_utils import ZooTestCase
  from zoo.pipeline.api.autograd import *
  import zoo.pipeline.api.autograd
  from zoo.pipeline.api.keras.layers import *
  from zoo.pipeline.api.keras.models import Sequential, Model
  from zoo.pipeline.api.autograd import Parameter, Constant
label_desc: Use image node_id 6 for calling the TestOperatorSpecial obj's underlying member method code with example usage: obj.test_unsqueeze_2D() without return types