code: def sigmoid(x: float):
      """Sigmoid function.
  
      Parameters
      ----------
      x
  
      """
      if x < -30:
          return 0
      if x > 30:
          return 1
      return 1 / (1 + math.exp(-x))
  
imports: from __future__ import annotations
  import functools
  import itertools
  import math
  import operator
  import numpy
  import scipy
label_desc: Use image node_id 9 for calling a global function with example usage: sigmoid(x) and returns: unknown, int, int