[{'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:b"def new_col_categorical(data , columns = [] , remove_original = True):\\n    for i in columns:\\n        unique_cols = data[i].unique()\\n        if len(unique_cols) < 20:\\n            print(\'\\\\nCorrect Type on Column -> \',i)\\n            print(\'Unique data in this Column is -> \',unique_cols)\\n        else:\\n            return data\\n    if remove_original == False:\\n        original_data = data[columns]\\n    data = pd.get_dummies(data , columns = columns)\\n    if remove_original == False:\\n        data = pd.concat([data,original_data] , axis=1)\\n    return data\\n        "'}, {'role': 'assistant', 'content': 'data_preprocessing'}]