code: def convert_float_to_str(x, sign=""):
      """convert floats to str but do better than numpy and pandas"""
      if hasattr(x, "values"):
          x = x.values
      y = [None] * len(x)
      for i, val in enumerate(x):
          y[i] = sign + str(val) if val > 0 else str(val)
      return y
  
label_desc: Use image node_id 2 for calling a global function with example usage: convert_float_to_str(x, sign) and returns: y