code: def transform(self, X, y=None):
      return self._concatenate_indicator(X, None)
  
imports: import numpy
  import pytest
  from sklearn.impute._base import _BaseImputer
  from sklearn.impute._iterative import _assign_where
  from sklearn.utils._mask import _get_mask
  from sklearn.utils._testing import _convert_container, assert_allclose
label_desc: Use image node_id 2 for calling the NoTransformIndicatorImputer obj's underlying member method code with example usage: obj.transform(X, y) and returns: self