Returns a set of trial neural architecture, as a serializable object.

        Parameters
        ----------
        parameter_id : int

def generate_parameters(self, parameter_id):
        """
        Returns a set of trial neural architecture, as a serializable object.

        Parameters
        ----------
        parameter_id : int
        """
        if not self.history:
            self.init_search()

        new_father_id = None
        generated_graph = None
        if not self.training_queue:
            new_father_id, generated_graph = self.generate()
            new_model_id = self.model_count
            self.model_count += 1
            self.training_queue.append((generated_graph, new_father_id, new_model_id))
            self.descriptors.append(generated_graph.extract_descriptor())

        graph, father_id, model_id = self.training_queue.pop(0)

        # from graph to json
        json_model_path = os.path.join(self.path, str(model_id) + ".json")
        json_out = graph_to_json(graph, json_model_path)
        self.total_data[parameter_id] = (json_out, father_id, model_id)

        return json_out