[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': "Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:train_gen = flow_from_dataframe(core_idg, train_df, \n                             path_col = 'path',\n                            y_col = 'labels', \n                            target_size = IMG_SIZE,\n                            batch_size = 32)\n\nvalid_gen = flow_from_dataframe(core_idg, valid_df, \n                             path_col = 'path',\n                            y_col = 'labels', \n                            target_size = IMG_SIZE,\n                            batch_size = 256) # we can use much larger batches for evaluation\n# used a fixed dataset for evaluating the algorithm\ntest_X, test_Y = next(flow_from_dataframe(core_idg, \n                               valid_df, \n                             path_col = 'path',\n                            y_col = 'labels', \n                            target_size = IMG_SIZE,\n                            batch_size = 1024)) # one big batch"}, {'role': 'assistant', 'content': 'data_preprocessing'}]