parameters: (self, X, y=None)
return_statement: return self
docstring: Do nothing and return the estimator unchanged
  
          This method is just there to implement the usual API and hence
          work in pipelines.
  
          Parameters
          ----------
          X : array-like
docstring_summary: Do nothing and return the estimator unchanged
docstring_tokens: Do nothing and return the estimator unchanged
function: def fit(self, X, y=None):
          """Do nothing and return the estimator unchanged
  
          This method is just there to implement the usual API and hence
          work in pipelines.
  
          Parameters
          ----------
          X : array-like
          """
          check_array(X, accept_sparse='csr')
          return self
function_tokens: def fit ( self , X , y = None ) : check_array ( X , accept_sparse = 'csr' ) return self