code: def _sigmoid(self, x):
      return 1.0 / (1.0 + np.exp(np.float32(-x)))
  
file_path: pytorch/caffe2/contrib/fakelowp/test/test_deq_swish_quant_nnpi.py
imports: import numpy
  import caffe2.python.fakelowp.init_shared_libs
  from caffe2.python import core, workspace
  from caffe2.python.onnx.onnxifi import onnxifi_caffe2_net
  from caffe2.python.fakelowp.test_utils import print_test_debug_info
  import caffe2.python.serialized_test.serialized_test_util
  import datetime
  from hypothesis import settings
label_desc: Use image node_id 2 for calling the DeqSwishQuantTest obj's underlying member method code with example usage: obj._sigmoid(x) and returns: unknown