[{'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:def evalerror(preds, dtrain):\n\n    labels = dtrain.get_label()\n    assert len(preds) == len(labels)\n    labels = labels.tolist()\n    preds = preds.tolist()\n    terms_to_sum = [(math.log(labels[i] + 1) - math.log(max(0,preds[i]) + 1)) ** 2.0 for i,pred in enumerate(labels)]\n    return 'error', (sum(terms_to_sum) * (1.0/len(preds))) ** 0.5"}, {'role': 'assistant', 'content': 'helper_functions'}]