code: def init(self):
      # Precompute the two moving averages
      self.sma1 = self.I(SMA, self.data.Close, self.n1)
      self.sma2 = self.I(SMA, self.data.Close, self.n2)
  
file_path: backtesting.py/doc/examples/Quick Start User Guide.py
imports: from backtesting.test import GOOG
  import pandas
  from backtesting import Strategy
  from backtesting.lib import crossover
  from backtesting import Backtest
label_desc: Use image node_id 1 for calling the SmaCross obj's underlying member method code with example usage: obj.init() without return types