[{'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:vectorizer_process = CountVectorizer(preprocessor = empty_preprocessor,analyzer='word',stop_words='english' )\nword_matrix_process= vectorizer_process.fit_transform(train_all)\ndev_matrix_process = vectorizer_process.transform(dev_all)\nmodel_LG_L1 = LogisticRegression(penalty ='l1',C=560) #C from the above test\nmodel_LG_L1.fit(word_matrix_process, train_labels)\nindex=[]\nfor i,z in enumerate(np.sum(np.abs(model_LG_L1.coef_),axis=0) ):\nif z!=0:\nindex.append(i)"}, {'role': 'assistant', 'content': 'modelling'}]