code: def test_basic_addmm(self):
      class SimpleOp(nn.Module):
          def forward(self, x, y, z):
              out1 = x.addmm(y, z, beta=0.1, alpha=0.2)
              out2 = torch.addmm(x, y, z, beta=0.1, alpha=0.2)
              # addmm_
              return out1, out2
  
      self.checkExportImport(
          SimpleOp(),
          (
              torch.randn(2, 3),
              torch.randn(2, 3),
              torch.randn(3, 3),
          ),
      )
  
imports: import unittest
  import torch
  import nni.nas.nn.pytorch.layers
  from .convert_mixin import ConvertMixin, ConvertWithShapeMixin
label_desc: Use image node_id 11 for calling the TestConvert obj's underlying member method code with example usage: obj.test_basic_addmm() and returns: out1,  out2