code: def _plotlabel(self):
      # override to always print the lookback label and do it before movav
      plabels = [self.p.period]
      plabels += [self.p.lookback]
      plabels += [self.p.movav] * self.p.notdefault("movav")
      return plabels
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  from .None import RSI
label_desc: Use image node_id 1 for calling the RelativeMomentumIndex obj's underlying member method code with example usage: obj._plotlabel() and returns: plabels