對于住房數據集，我嘗試使用 sklearn_pandas 中的 DataFrameMapper() 在選定的列上應用多項式特征。我的代碼：from sklearn.preprocessing import PolynomialFeatures from sklearn_pandas import DataFrameMapper mapper = DataFrameMapper([('houseAge_income', PolynomialFeatures(2)),('median_income', PolynomialFeatures(2)),(['latitude', 'housing_median_age', 'total_rooms', 'population', 'median_house_value', 'ocean_proximity']], None) ]) poly_feature = mapper.fit_transform(housing) 當我嘗試使用houseAge_income.reshape(-1, 1)在 DataFrameMapper() 中，我遇到了另一個問題：---------------------------------------------------------------------------KeyError                                  Traceback (most recent call last)/usr/local/lib/python3.6/dist-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)   2645             try:-> 2646                 return self._engine.get_loc(key)   2647             except KeyError:pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()KeyError: 'houseAge_income.reshape(-1, 1)'During handling of the above exception, another exception occurred:KeyError                                  Traceback (most recent call last)5 frames/usr/local/lib/python3.6/dist-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)   2646                 return self._engine.get_loc(key)   2647             except KeyError:-> 2648                 return self._engine.get_loc(self._maybe_cast_indexer(key))   2649         indexer = self.get_indexer([key], method=method, tolerance=tolerance)   2650         if indexer.ndim > 1 or indexer.size > 1:pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()誰能告訴我，我錯過了什么？