[{'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:# signup_method<br>airbnb_df["signup_method"] = (airbnb_df["signup_method"] == "basic").astype(int)<br>test_df["signup_method"]   = (test_df["signup_method"] == "basic").astype(int)<br><br># signup_flow<br>airbnb_df["signup_flow"] = (airbnb_df["signup_flow"] == 3).astype(int)<br>test_df["signup_flow"]   = (test_df["signup_flow"] == 3).astype(int)<br><br># language<br>airbnb_df["language"] = (airbnb_df["language"] == \'en\').astype(int)<br>test_df["language"]   = (test_df["language"] == \'en\').astype(int)<br><br># affiliate_channel<br>airbnb_df["affiliate_channel"] = (airbnb_df["affiliate_channel"] == \'direct\').astype(int)<br>test_df["affiliate_channel"]   = (test_df["affiliate_channel"] == \'direct\').astype(int)<br><br># affiliate_provider<br>airbnb_df["affiliate_provider"] = (airbnb_df["affiliate_provider"] == \'direct\').astype(int)<br>test_df["affiliate_provider"]   = (test_df["affiliate_provider"] == \'direct\').astype(int)<br>'}, {'role': 'assistant', 'content': "['data_preprocessing']"}]