code: def __calculate_sigmoid(self):
          '''
          Function of temperature.
  
          Returns:
              Sigmoid.
  
          '''
          sigmoid = 1 / np.log(self.t * self.time_rate + 1.1)
          return sigmoif __calculate_sigmoid(self):
          '''
          Function of temperature.
  
          Returns:
              Sigmoid.
  
          '''
          sigmoid = 1 / np.log(self.t * self.time_rate + 1.1)
          return sigmoid
docs: Function of temperature.
  
          Returns:
              Sigmoid.