code: def test_basic_abs(self):
      class SimpleOp(nn.Module):
          def forward(self, x):
              out1 = x.abs()
              out11 = x.absolute()
              out2 = torch.abs(x)
              # out3 = x.abs_()
              # out33 = x.absolute_()
              return out1, out11, out2  # , out3, out33
  
      self.checkExportImport(SimpleOp(), (torch.tensor([-1, -2, 3]),))
  
imports: import unittest
  import torch
  import nni.nas.nn.pytorch.layers
  from .convert_mixin import ConvertMixin, ConvertWithShapeMixin
label_desc: Use image node_id 5 for calling the TestConvert obj's underlying member method code with example usage: obj.test_basic_abs() and returns: out1,  out11,  out2