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