code: def peakmem_int(self, frames):
      df = frames["int"]
      for _ in range(100_000):
          df.to_json()
  
imports: import sys
  import numpy
  from pandas import DataFrame, Index, concat, date_range, json_normalize, read_json, timedelta_range
  from ..pandas_vb_common import BaseIO
  from ..pandas_vb_common import setup
label_desc: Use image node_id 2 for calling the ToJSONMem obj's underlying member method code with example usage: obj.peakmem_int(frames) without return types