code: def forward_on_instance(self, instance: Instance) -> Dict[str, numpy.ndarray]:
          
          return self.forward_on_instances([instance])[0]
docs: Takes an :class:`~allennlp.data.instance.Instance`, which typically has raw text in it,
          converts that text into arrays using this model's :class:`Vocabulary`, passes those arrays
          through :func:`self.forward()` and :func:`self.decode()` (which by default does nothing)
          and returns the result.  Before returning the result, we convert any
          ``torch.Tensors`` into numpy arrays and remove the batch dimension.