[{'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:#First the train set\nnum_phrase = train[\'Phrase\'].size\nclean_train_phrase = []\nfor i in range(0, num_phrase):\n    if( (i+1)%10000 == 0 ):\n        print ("Review %d of %d\\\n" % ( i+1, num_phrase ))\n    clean_train_phrase.append(phrase_to_words(train[\'Phrase\'][i]))\''}, {'role': 'assistant', 'content': "['data_preprocessing']"}]