[{'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:dtype = {'Semana': np.uint8, \n         'Agencia_ID': np.uint16, \n         'Canal_ID': np.uint8,\n         'Ruta_SAK': np.uint16, \n         'Cliente_ID': np.uint32, \n         'Producto_ID': np.uint16,\n         'Demanda_uni_equil': np.uint16}\n\nfilename='../input/train.csv'\n\n\n%time train = pd.read_csv(filename, usecols=dtype.keys(), dtype=dtype, warn_bad_lines= True,engine='c')\ntrain.head()"}, {'role': 'assistant', 'content': 'load_data'}]