code: def setup_cache(self):
      df = DataFrame([[1]])
      df2 = DataFrame(
          range(8), date_range("1/1/2000", periods=8, freq="min")
      )
      frames = {"int": df, "float": df.astype(float), "datetime": df2}
  
      return frames
  
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 1 for calling the ToJSONMem obj's underlying member method code with example usage: obj.setup_cache() and returns: frames