class_docstr: Base class for all imputers.
  
  It adds automatically support for `add_indicator`.
class_docstr_tok: ["Base","class","for","all","imputers",".","It","adds","automatically","support","for","`","add_indicator","`","."]
code: def _more_tags(self):
      return {"allow_nan": is_scalar_nan(self.missing_values)}
  
imports: import numbers
  import warnings
  from collections import Counter
  from functools import partial
  from typing import Callable
  import numpy
  import numpy.ma
  from scipy import sparse
  from ..base import BaseEstimator, TransformerMixin, _fit_context
  from ..utils import _is_pandas_na, is_scalar_nan
  from ..utils._mask import _get_mask
  from ..utils._param_validation import MissingValues, StrOptions
  from ..utils.fixes import _mode
  from ..utils.sparsefuncs import _get_median
  from ..utils.validation import FLOAT_DTYPES, _check_feature_names_in, check_is_fitted
label_desc: Use image node_id 6 for calling the _BaseImputer obj's underlying member method code with example usage: obj._more_tags() and returns: dict