Gets the list of the output nodes present in the graph for inference
        :return: list of node names

def _process_graph(self):
        """
        Gets the list of the output nodes present in the graph for inference
        :return: list of node names
        """
        all_nodes = [x.name for x in self.graph.as_graph_def().node]
        nodes = [x for x in all_nodes if x in self.possible_output_nodes]
        logger.info('List of nodes to export for brain :' + self.brain.brain_name)
        for n in nodes:
            logger.info('\t' + n)
        return nodes