code: def __loadBarFeed(self):
      ret = ninjatraderfeed.Feed(ninjatraderfeed.Frequency.MINUTE)
      barFilter = csvfeed.USEquitiesRTH()
      ret.setBarFilter(barFilter)
      ret.addBarsFromCSV(
          TradesAnalyzerTestCase.TestInstrument,
          common.get_data_file_path("nt-spy-minute-2011.csv"),
      )
      return ret
  
imports: import datetime
  import math
  from distutils import version
  import pytz
  import numpy
  from .None import common
  from .None import strategy_test
  from .None import position_test
  from pyalgotrade.barfeed import ninjatraderfeed
  from pyalgotrade.barfeed import csvfeed
  from pyalgotrade.stratanalyzer import trades
  from pyalgotrade import broker
  from pyalgotrade.broker import backtesting
label_desc: Use image node_id 1 for calling the TradesAnalyzerTestCase obj's underlying member method code with example usage: obj.__loadBarFeed() and returns: ret