code: def data_all_censored(self):
      time = self.time
      event = np.repeat(False, len(time))
      true_x = self.true_x
      true_y = np.ones(true_x.shape[0])
      km_var = np.ones((2, true_x.shape[0]))
      return time, event, true_x, true_y, km_var
  
imports: from os.path import dirname, join
  import numpy
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  import pandas
  import pytest
  from sksurv.nonparametric import CensoringDistributionEstimator, SurvivalFunctionEstimator, kaplan_meier_estimator, nelson_aalen_estimator
  from sksurv.testing import FixtureParameterFactory
  from sksurv.util import Surv
label_desc: Use image node_id 4 for calling the SimpleDataKMCases obj's underlying member method code with example usage: obj.data_all_censored() and returns: time,  event,  true_x,  true_y,  km_var