[{'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:from sklearn.model_selection import train_test_split\ny=train['country_destination']\nX=train.drop(['country_destination','id'],axis=1)\nfrom imblearn.combine import SMOTETomek\n# transform the dataset\nsmotetomek = SMOTETomek(sampling_strategy='auto')\n\n# split the dataset into train and test sets\nX_train1, X_test1, y_train1, y_test1 = train_test_split(X, y, test_size=0.30, random_state=1,shuffle=True,stratify=y)\nX_train, y_train = smotetomek.fit_resample(X_train1, y_train1)"}, {'role': 'assistant', 'content': 'data_preprocessing'}]