[{'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:import numpy as np\nimport pandas as pd\nimport math\ncolum_target=pd.read_csv("../input/train.csv",usecols=[\'Demanda_uni_equil\'])\nm=colum_target[\'Demanda_uni_equil\'].tolist()\n#print(m)\n#m=np.mean(np.linalg.logm(colum_target[\'Demanda_uni_equil\'].value+1))\n#m=np.exp(math.log(+1).mean())\n#mm=colum_target[\'m\'].mean()\n#print(mm)\n#result_mean=pd.read_csv("../input/test.csv",usecols=[\'id\'])\n#result_mean[\'Demanda_uni_equil\']=exp(mean)\n#result_mean.to_csv(\'result_mean.csv\',index=False)\''}, {'role': 'assistant', 'content': 'helper_functions'}]