code: def closes(self, mask_last_sid):
      data = self.arange_data(dtype=np.float64)
      if mask_last_sid:
          data[:, -1] = np.nan
      return data
  
imports: from __future__ import division
  from nose_parameterized import parameterized
  from six.moves import range
  import numpy
  import pandas
  import talib
  from numpy.random import RandomState
  from zipline.lib.adjusted_array import AdjustedArray
  from zipline.pipeline.data import USEquityPricing
  from zipline.pipeline.factors import BollingerBands, Aroon, FastStochasticOscillator, IchimokuKinkoHyo, LinearWeightedMovingAverage, RateOfChangePercentage, TrueRange, MovingAverageConvergenceDivergenceSignal, AnnualizedVolatility, RSI
  from zipline.testing import check_allclose, parameter_space
  from zipline.testing.fixtures import ZiplineTestCase
  from zipline.testing.predicates import assert_equal
  from .base import BaseUSEquityPipelineTestCase
label_desc: Use image node_id 1 for calling the BollingerBandsTestCase obj's underlying member method code with example usage: obj.closes(mask_last_sid) and returns: data