def handle(self,
               t_input: inference.TranslatorInput,
               t_output: inference.TranslatorOutput,
               t_walltime: float = 0.):
        """
        :param t_input: Translator input.
        :param t_output: Translator output.
        :param t_walltime: Total wall-clock time for translation.
        """
        plot_attention(t_output.attention_matrix,
                       t_input.tokens,
                       t_output.tokens,
                       "%s_%s.png" % (self.plot_prefix, t_input.sentence_id))
:param t_input: Translator input.
        :param t_output: Translator output.
        :param t_walltime: Total wall-clock time for translation.