[{'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:#trainn and test validate\n\nfeatures=data_merged.columns.drop(['Sales','Date'])\nfrom sklearn.model_selection import train_test_split\ntrain_x,validate_x,train_y,validate_y=train_test_split(data_merged[features],np.log(data_merged['Sales']+1),test_size=0.2,random_state=1)\n\ntrain_x.shape,validate_x.shape,train_y.shape,validate_y.shape"}, {'role': 'assistant', 'content': "['data_preprocessing']"}]