[{'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:#loop for chi square values\ndef calculate_chi_square_values(df, alpha=.05):\n    chi2_dict = {}\n    numerical_col, cat_col  = get_numerical_and_categorical_col(df)\n    for i in cat_col:\n        for j in cat_col:\n            if i!=j and (j+' '+i) not in chi2_dict.keys():\n                chi2, p, dof, ex = chi2_contingency(pd.crosstab(df[i], df[j]))\n                chi2_dict[i+' '+j] = 'Independent? '+ str(p>alpha)\n    return chi2_dict"}, {'role': 'assistant', 'content': 'evaluation'}]