[{'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:a = np.array([1, 2, 3, 4, 5])\nb = np.array([1, 2, 3, 4, 5])\nc = np.array([4, 3, 2, 5, 1])\nuni_a = np.unique(a)\nuni_b = np.unique(b)\na_map = dict(zip(uni_a,range(len(uni_a))))\nb_map = dict(zip(uni_b,range(len(uni_b))))\nuser_idx =  np.array([ a_map[user] for user in a])\nsong_idx =  np.array([ b_map[song] for song in b])\nmodel = MF_RS(len(uni_a), len(uni_b), 7)\nnp.random.seed(1)\nmodel.train(user_idx, song_idx, c)'}, {'role': 'assistant', 'content': 'modelling'}]