class_docstr: Pandas dataframe class with a simplified selection function
code: def _constructor_expanddim(self) -> tp.Type["Selector"]:
      return Selector
  
file_path: nevergrad/nevergrad/benchmark/utils.py
imports: from collections import abc
  import numpy
  import pandas
  import nevergrad.common.typing
  from nevergrad.common import testing
label_desc: Use image node_id 1 for calling the Selector obj's underlying member method code with example usage: obj._constructor_expanddim() and returns: Selector