code: def sigmoid(x):  # type: ignore
      if x > 0:
          return 1 / (1 + np.exp(-x))
      return np.exp(x) / (1 + np.exp(x))
  
imports: import numpy
  from onnx.reference.ops._op import OpRunUnaryNum
label_desc: Use image node_id 1 for calling a global function with example usage: sigmoid(x) and returns: unknown, unknown