code: def verify_integrity(self):
      return self._verify_integrity
  
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core import OutputType
  from ...serialization.serializables import AnyField, BoolField
  from ..operands import DataFrameOperand, DataFrameOperandMixin
  from ..utils import build_empty_df, parse_index
label_desc: Use image node_id 5 for calling the DataFrameSetIndex obj's underlying member method code with example usage: obj.verify_integrity() and returns: self