[{'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:parameters = {\n    'n_estimators': list(range(10, 300, 20)), \n    'learning_rate': [l / 100 for l in range(5, 100, 20)], \n    'max_depth': list(range(1, 20,3)),\n    'gamma':[2,3],\n    'eta':[0.8,0.9],\n    'reg_alpha':[0.5,0.6,0.7,0.8],\n    'reg_lambda':[0.5,0.6,0.7,0.8]\n}\nparameters"}, {'role': 'assistant', 'content': 'modelling'}]