Call the generators to generate the initial architectures for the search.

def init_search(self):
        """Call the generators to generate the initial architectures for the search."""
        if self.verbose:
            logger.info("Initializing search.")
        for generator in self.generators:
            graph = generator(self.n_classes, self.input_shape).generate(
                self.default_model_len, self.default_model_width
            )
            model_id = self.model_count
            self.model_count += 1
            self.training_queue.append((graph, -1, model_id))
            self.descriptors.append(graph.extract_descriptor())

        if self.verbose:
            logger.info("Initialization finished.")