我試圖從scikit-learn 0.16實現LogisticRegressionCV類,並且很難讓它使用不同的評分函數。該文件說在的評分函數傳遞從sklearn.metrics所以我嘗試了下面的代碼:如何在Scikit-learn中實現LogisticRegressionCV中的不同評分函數?
from sklearn.linear_model import LogisticRegressionCV
from sklearn.metrics import log_loss
...
model_regression = LogisticRegressionCV(scoring=log_loss)
model_regression.fit(data_combined, winners_losers)
但是我得到的擬合函數以下錯誤:
File "C:\Anaconda3\lib\site-packages\sklearn\linear_model\logistic.py", line 1381, in fit
for label in iter_labels
File "C:\Anaconda3\lib\site-packages\sklearn\externals\joblib\parallel.py", line 659, in __call__
self.dispatch(function, args, kwargs)
File "C:\Anaconda3\lib\site-packages\sklearn\externals\joblib\parallel.py", line 406, in dispatch
job = ImmediateApply(func, args, kwargs)
File "C:\Anaconda3\lib\site-packages\sklearn\externals\joblib\parallel.py", line 140, in __init__
self.results = func(*args, **kwargs)
File "C:\Anaconda3\lib\site-packages\sklearn\linear_model\logistic.py", line 844, in _log_reg_scoring_path
scores.append(scoring(log_reg, X_test, y_test))
File "C:\Anaconda3\lib\site-packages\sklearn\metrics\classification.py", line 1403, in log_loss
T = lb.fit_transform(y_true)
File "C:\Anaconda3\lib\site-packages\sklearn\base.py", line 433, in fit_transform
return self.fit(X, **fit_params).transform(X)
File "C:\Anaconda3\lib\site-packages\sklearn\preprocessing\label.py", line 315, in fit
self.y_type_ = type_of_target(y)
File "C:\Anaconda3\lib\site-packages\sklearn\utils\multiclass.py", line 287, in type_of_target
'got %r' % y)
ValueError: Expected array-like (array or non-string sequence), got LogisticRegression(C=1.0, class_weight=None, dual=False, fit_intercept=True,
intercept_scaling=1, max_iter=100, multi_class='ovr',
penalty='l2', random_state=None, solver='liblinear', tol=0.0001,
verbose=0)
什麼我在這裏做錯了嗎?如果沒有'scoring = log_loss'參數,那麼該函數可以正常工作,所以它必須與我如何傳遞函數有關?
嗯....文檔說,字符串,可調用,或無。傳遞可調用對象時也會出現此錯誤。 – user48956
是的,但不是任意可調用的,而是一個可調用的,它遵守我鏈接到的文檔中指定的接口。我編輯了我的答案,以總結文檔。 –