code: def call(self, x, *args):
          
          if isinstance(x, list):
              return [self.convert_token(tok, *args) for tok in x]
          return self.convert_token(x, *args)
docs: Apply _only_ the convert_token function of the current pipeline
          to the input. If the input is a list, a list with the results of
          applying the `convert_token` function to all input elements is
          returned.
  
          Arguments:
              x: The input to apply the convert_token function to.
              Positional arguments: Forwarded to the `convert_token` function
                  of the current Pipeline.