code: def test_quantized_sigmoid(self):
      self.generic_unary_test(torch.nn.Sigmoid())
  
imports: import io
  import caffe2.python.onnx.backend
  import numpy
  import onnx
  import pytorch_test_common
  import torch.ao.nn.quantized
  import torch.nn
  import torch.onnx
  from torch.testing._internal import common_utils
label_desc: Use image node_id 14 for calling the TestQuantizedOps obj's underlying member method code with example usage: obj.test_quantized_sigmoid() without return types