class_docstr: Transformers that may update their params, like ARIMAs
code: def _check_endog(self, y):
      if y is None:
          raise ValueError("endog array cannot be None when updating")
  
file_path: pmdarima/pmdarima/preprocessing/base.py
imports: from sklearn.base import BaseEstimator, TransformerMixin
  import abc
  from ..compat.numpy import DTYPE
  from ..utils import check_exog, check_endog
label_desc: Use image node_id 1 for calling the UpdatableMixin obj's underlying member method code with example usage: obj._check_endog(y) without return types