code: def transform(self, X):
      if self.preprocessor is None:
          raise NotImplementedError()
      Xt = self.preprocessor.transform(X)
      if Xt.shape[1] == 0:
          raise ValueError(
              "%s removed all features." % self.__class__.__name__
          )
      return Xt
  
label_desc: Use image node_id 2 for calling the SelectPercentileBase obj's underlying member method code with example usage: obj.transform(X) and returns: Xt