python import akshare as ak stock_data = ak.stock_zh_a_daily(symbol="sz000001", start_date="20200101", end_date="20210101") stock_data = stock_data.fillna(method="ffill") monthly_stock_data = stock_data.resample("M").last() correlation_matrix = monthly_stock_data.corr() important_features = correlation_matrix[correlation_matrix["RSI"] > 0.5].index print(important_features)