[{'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:questions = []\nexpected = []\nseen = set()\nprint('Generating data...')\nwhile len(questions) < TRAINING_SIZE:\nf = lambda: int(''.join(np.random.choice(list('0123456789'))\nfor i in range(np.random.randint(1, DIGITS + 1))))\na, b = f(), f()\nkey = tuple(sorted((a, b)))\nif key in seen:\ncontinue\nseen.add(key)\nq = '{}+{}'.format(a, b)\nquery = q + ' ' * (MAxLEN - len(q))\nans = str(a + b)\nans += ' ' * (DIGITS + 1 - len(ans))\nif INVERT:\nquery = query[::-1]\nquestions.append(query)\nexpected.append(ans)\nprint('Total addition questions:', len(questions))"}, {'role': 'assistant', 'content': 'data_preprocessing'}]