I am getting key error : 0 from these lines of code
grid.cv_results_[0].parameters
print(grid.cv_results_[0].cv_validation_scores)
print(grid.cv_results_[0].mean_validation_scores)
0 Answer
GridSearchCV's cv_results_ returns a dictionary. Therefore you can't access it via index. For example:
svc = svm.SVC()
grid = GridSearchCV(svc, parameters)
grid.fit(data, target)
print(grid.cv_results_.keys())
Output will be:
['mean_fit_time', 'mean_score_time', 'mean_test_score',...
'param_C', 'param_kernel', 'params',...
'rank_test_score', 'split0_test_score',...
'split2_test_score', ...
'std_fit_time', 'std_score_time', 'std_test_score']
You can access cv_results_ items like:
grid.cv_results_['params'] ##instead of grid.cv_results_[0].parameters
grid.cv_results_['std_test_score'] ##for test scores
grid.cv_results_['mean_test_score'] ##for mean test scores
这家伙很懒，什么都没留下...