code: def sigmoid_sign(ary, thresh):
      def sigmoid(x):
          return 1 / (1 + np.exp(-x * np.e)) - 0.5
  
      return sigmoid(ary / thresh) * thresh
  
file_path: FinRL/finrl/meta/env_stock_trading/env_nas100_wrds.py
imports: from __future__ import annotations
  import os
  import gym
  import numpy
  from numpy import random
label_desc: Use image node_id 7 for calling the StockEnvNAS100 obj's underlying member method code with example usage: obj.sigmoid_sign(ary, thresh) and returns: unknown, unknown