class_docstr: Identity transformer, returns data unchanged in transform/inverse_transform.
docstr: Transform X and return a transformed version.
  
  private _transform containing the core logic, called from transform
  
  Parameters
  ----------
  X : any sktime compatible data, Series, Panel, or Hierarchical
  y : optional, default=None
      ignored, argument present for interface conformance
  
  Returns
  -------
  X, identical to input
docstr_tok: ["Transform","X","and","return","a","transformed","version",".","private","_transform","containing","the","core","logic",",","called","from","transform","Parameters","--","--","--","--","--","X",":","any","sktime","compatible","data",",","Series",",","Panel",",","or","Hierarchical","y",":","optional",",","default=None","ignored",",","argument","present","for","interface","conformance","Returns","--","--","--","-","X",",","identical","to","input"]
code: def _transform(self, X, y=None):
      """Transform X and return a transformed version.
  
      private _transform containing the core logic, called from transform
  
      Parameters
      ----------
      X : any sktime compatible data, Series, Panel, or Hierarchical
      y : optional, default=None
          ignored, argument present for interface conformance
  
      Returns
      -------
      X, identical to input
      """
      return X
  
imports: from sktime.transformations.base import BaseTransformer
  from sktime.transformations.compose._common import CORE_MTYPES
label_desc: Use image node_id 1 for calling the Id obj's underlying member method code with example usage: obj._transform(X, y) and returns: X