code: def calculate_return(self, old, new):
      return new / old
  
imports: import os
  import ta
  import sys
  import json
  import math
  import pickle
  import random
  import requests
  import collections
  import numpy
  from os import walk, path
  import pandas
  import yfinance
  import datetime
  from scipy.stats import linregress
  from datetime import datetime, timedelta
  import matplotlib.pyplot
  from sklearn.ensemble import IsolationForest
  from data_loader import DataEngine
  import warnings
  import argparse
label_desc: Use image node_id 4 for calling the Surpriver obj's underlying member method code with example usage: obj.calculate_return(old, new) and returns: unknown