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我使用的 scikit-learn 版本是 0.22.1。我在 grid_scores(0.18) 和 cv_results(0.18+) 处收到错误，因为我有 sklearn 0.22 我使用了 cv_result..

fig,ax= plt.subplots()
fig.set_size_inches(12,5)
#df = pd.DataFrame(grid_ridge_m.grid_scores_)
df = pd.DataFrame(grid_ridge_m.cv_results_)
df["alpha"] = df["parameters"].apply(lambda x:x["alpha"])
df["rmsle"] = df["mean_validation_score"].apply(lambda x:-x)
sn.pointplot(data=df,x="alpha",y="rmsle",ax=ax)

错误：当我使用 (grid_ridge_m.cv_results_) 时出现以下错误

KeyError                                  Traceback (most recent call last)
~\AppData\Roaming\Python\Python37\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
   2896             try:
-> 2897                 return self._engine.get_loc(key)
   2898             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: 'parameters'

During handling of the above exception, another exception occurred:

KeyError                                  Traceback (most recent call last)
<ipython-input-46-69e67dace19f> in <module>
     17 #df = pd.DataFrame(grid_ridge_m.grid_scores_)
     18 df = pd.DataFrame(grid_ridge_m.cv_results_)
---> 19 df["alpha"] = df["parameters"].apply(lambda x:x["alpha"])
     20 df["rmsle"] = df["mean_validation_score"].apply(lambda x:-x)
     21 sn.pointplot(data=df,x="alpha",y="rmsle",ax=ax)

~\AppData\Roaming\Python\Python37\site-packages\pandas\core\frame.py in __getitem__(self, key)
   2993             if self.columns.nlevels > 1:
   2994                 return self._getitem_multilevel(key)
-> 2995             indexer = self.columns.get_loc(key)
   2996             if is_integer(indexer):
   2997                 indexer = [indexer]

~\AppData\Roaming\Python\Python37\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
   2897                 return self._engine.get_loc(key)
   2898             except KeyError:
-> 2899                 return self._engine.get_loc(self._maybe_cast_indexer(key))
   2900         indexer = self.get_indexer([key], method=method, tolerance=tolerance)
   2901         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()

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: 'parameters'
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