[{'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:# XGBoost Training Parameter Reference: \n#   https://github.com/dmlc/xgboost/blob/master/doc/parameter.md\n#regressor = xgb.XGBRegressor(max_depth=5,eta=0.1,subsample=0.7,num_round=150)\nregressor = xgb.XGBRegressor(max_depth=5,n_estimators=150)'}, {'role': 'assistant', 'content': 'modelling'}]