code: def is_not_constant(self, iSeries):
      lFirst = iSeries[0]
      for lValue in iSeries[1:]:
          if lValue != lFirst:
              return True
      return False
  
imports: import pandas
  import numpy
  from .None import Time
  from .None import Perf
  from .None import Plots
  from .None import Utils
  import time
label_desc: Use image node_id 3 for calling the cAutoRegressiveEstimator obj's underlying member method code with example usage: obj.is_not_constant(iSeries) and returns: False, True