code: def test_basic_bitwise(self):
      class SimpleOp(nn.Module):
          def forward(self, x, y):
              out1 = x.bitwise_not()
              out2 = x.bitwise_and(y)
              out3 = x.bitwise_or(y)
              out4 = x.bitwise_xor(y)
              return out1, out2, out3, out4
  
      self.checkExportImport(
          SimpleOp(),
          (
              torch.tensor([-1, -2, 3], dtype=torch.int8),
              torch.tensor([1, 0, 3], dtype=torch.int8),
          ),
      )
  
imports: import unittest
  import torch
  import nni.nas.nn.pytorch.layers
  from .convert_mixin import ConvertMixin, ConvertWithShapeMixin
label_desc: Use image node_id 20 for calling the TestConvert obj's underlying member method code with example usage: obj.test_basic_bitwise() and returns: out1,  out2,  out3,  out4