text: """IdentityTransformer module."""
  
  from rdt.transformers.base import BaseTransformer
  
  
  class IdentityTransformer(BaseTransformer):
      """Identity transformer that produces the same data.
  
      This transformer is intended for testing purposes only. The transform and reverse transform
      of this data is equal to the input.
      """
  
      def _fit(self, data):
          """Fit the transformer to the data.
  
          Args:
              data (pandas.Series or numpy.ndarray):
                  Data to fit the transformer to.
          """
          self.OUTPUT_TYPES = {column: None for column in self.columns}
  
      def _transform(self, data):
          """Return the same input data.
  
          Args:
              data (pandas.Series or numpy.ndarray):
                  Data to transform.
  
          Returns:
              pandas.DataFrame or pandas.Series
          """
          return data
  
      def _reverse_transform(self, data):
          """Return the same input data.
  
          Args:
              data (pandas.Series or numpy.ndarray):
                  Data to revert.
  
          Returns:
              pandas.DataFrame or pandas.Series
          """
          return data
  