[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify code snippets into one of the following categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']."}, {'role': 'user', 'content': 'Identify the single most appropriate category to which the provided code belongs. Provide your response as a single category label without any additional information, commentary, or personal opinions.\\nPython Code:tokenizer = BertTokenizer.from_pretrained(\n    BERT_MODEL,\n    do_lower_case=CASED,\n    never_split = ("[UNK]", "[SEP]", "[PAD]", "[CLS]", "[MASK]", "[A]", "[B]", "[P]")\n)\n# These tokens are not actually used, so we can assign arbitrary values.\ntokenizer.vocab["[A]"] = -1\ntokenizer.vocab["[B]"] = -1\ntokenizer.vocab["[P]"] = -1'}, {'role': 'assistant', 'content': 'modelling'}]