[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify the code snippets into categories from the provided list of categories. List of categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']"}, {'role': 'user', 'content': 'Identify to which category the provided code belongs and assign the code snippet to at least 1 but up to 5 categories based on the probabilities, ignore if the probability of the category is negligible. Strictly provide your response as a list. Avoid providing any additional information, commentary, or personal opinions.\\nPython Code:b"# \\nfrom sklearn.model_selection import train_test_split\\n\\nX_train, X_test = train_test_split(train, test_size=0.2, random_state=2)\\n\\ndtrain = xgb.DMatrix(X_train[features], np.log1p(X_train.Sales))\\ndvalid = xgb.DMatrix(X_test[features], np.log1p(X_test.Sales))\\ndtest = xgb.DMatrix(test[features])\\n\\nwatchlist = [(dtrain, \'train\'),(dvalid, \'eval\')]\\ngbm = xgb.train(params, dtrain, num_trees, evals=watchlist, early_stopping_rounds=50, feval=rmspe_xg, verbose_eval=False)"'}, {'role': 'assistant', 'content': "['modelling']"}]