[{'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:desc_total=desc+desc_test\nvectorizer = CountVectorizer(lowercase=True, ngram_range=(1,10), analyzer='char_wb')\ndesc_total_vector = vectorizer.fit_transform(desc_total)\ndesc_vector=desc_total_vector[:trn_len]"}, {'role': 'assistant', 'content': 'modelling'}]