code: def _identity(X):
      """The identity function."""
      return X
  
imports: import warnings
  import numpy
  from ..base import BaseEstimator, TransformerMixin, _fit_context
  from ..utils._param_validation import StrOptions
  from ..utils._set_output import _get_output_config
  from ..utils.metaestimators import available_if
  from ..utils.validation import _allclose_dense_sparse, _check_feature_names_in, _is_pandas_df, check_array
label_desc: Use image node_id 1 for calling a global function with example usage: _identity(X) and returns: X