docstr: Configure the reference data.
docstr_tok: ["Configure","the","reference","data","."]
code: def _configure_ref(self) -> None:
      """
      Configure the reference data.
      """
      ids_ref_ref = self.x_ref[None, :, :] >= self.x_ref[:, None, :]
      self.ref_cdf_ref = np.sum(ids_ref_ref, axis=0) / self.n
  
imports: import numpy
  from typing import Any, Callable, List, Optional, Union
  from alibi_detect.base import DriftConfigMixin
  from alibi_detect.cd.base_online import BaseUniDriftOnline
  from alibi_detect.utils.misc import quantile
  import numba
  from tqdm import tqdm
  import warnings
label_desc: Use image node_id 2 for calling the CVMDriftOnline obj's underlying member method code with example usage: obj._configure_ref() without return types