code: def test_all_numbers_int8(self):
      generic_test(
          relay.qnn.sigmoid,
          lambda x: 1 / (1 + np.exp(-x)),
          input_dtype="int8",
      )
  
imports: from typing import Callable, List
  import numpy
  import pytest
  import scipy.special
  import tvm
  import tvm.testing
  from tvm import relay
  from tvm.relay.qnn.op.legalizations import hardswish_func
label_desc: Use image node_id 2 for calling the TestSigmoid obj's underlying member method code with example usage: obj.test_all_numbers_int8() without return types