[{'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:le = LabelEncoder() \n  \ntest['gender']= le.fit_transform(test['gender'])\ntest['signup_method']= le.fit_transform(test['signup_method']) \ntest['first_affiliate_tracked']= le.fit_transform(test['first_affiliate_tracked']) \ntest['signup_method']= le.fit_transform(test['signup_method']) \ntest['language']= le.fit_transform(test['language'])\ntest['affiliate_channel']= le.fit_transform(test['affiliate_channel'])\ntest['affiliate_provider']= le.fit_transform(test['affiliate_provider'])\ntest['signup_app']= le.fit_transform(test['signup_app'])\ntest['first_device_type']= le.fit_transform(test['first_device_type'])\ntest['first_browser']= le.fit_transform(test['first_browser'])\ntest['signup_flow']= le.fit_transform(test['signup_flow'])"}, {'role': 'assistant', 'content': "['data_preprocessing']"}]