docstr: Configure the reference data.
docstr_tok: ["Configure","the","reference","data","."]
code: def _configure_ref(self) -> None:
      """
      Configure the reference data.
      """
      self.sum_ref = np.sum(self.x_ref, axis=0)
  
imports: from tqdm import tqdm
  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
  from scipy.stats import hypergeom
  import numba
  import warnings
label_desc: Use image node_id 2 for calling the FETDriftOnline obj's underlying member method code with example usage: obj._configure_ref() without return types