code: def getCumulativeReturn(self):
      return self.__portfolioReturns.getCumulativeReturns()
  
imports: import math
  from pyalgotrade import stratanalyzer
  from pyalgotrade import observer
  from pyalgotrade import dataseries
label_desc: Use image node_id 6 for calling the ReturnsAnalyzerBase obj's underlying member method code with example usage: obj.getCumulativeReturn() and returns: self