code: def test_basic_angle(self):
      class SimpleOp(nn.Module):
          def forward(self, x):
              out1 = x.angle()
              out2 = torch.angle(x)
              return out1, out2
  
      self.checkExportImport(
          SimpleOp(), (torch.tensor([-1 + 1j, -2 + 2j, 3 - 3j]),)
      )
  
imports: import unittest
  import torch
  import nni.nas.nn.pytorch.layers
  from .convert_mixin import ConvertMixin, ConvertWithShapeMixin
label_desc: Use image node_id 15 for calling the TestConvert obj's underlying member method code with example usage: obj.test_basic_angle() and returns: out1,  out2