code: def peakmem_fixed(self, operation):
      for x in range(5):
          getattr(self.roll, operation)()
  
imports: import warnings
  import numpy
  import pandas
  from .pandas_vb_common import setup
label_desc: Use image node_id 2 for calling the PeakMemFixedWindowMinMax obj's underlying member method code with example usage: obj.peakmem_fixed(operation) without return types