テキスト分類のパイプラインのさまざまな設定を試してみたいと思います。scikit-learn PipelineとGridSearchCVを使用しているときのエラー
私はこの
pipe = Pipeline([('c_vect', CountVectorizer()),('feat_select', SelectKBest()),
('ridge', RidgeClassifier())])
parameters = {'c_vect__max_features': [10, 50, 100, None],
'feat_select__score_func': [chi2, f_classif, mutual_info_classif, SelectFdr, SelectFwe, SelectFpr],
'ridge__solver': ['sparse_cg', 'lsqr', 'sag'], 'ridge__tol': [1e-2, 1e-3], 'ridge__alpha': [0.01, 0.1, 1]}
gs_clf = GridSearchCV(pipe, parameters, n_jobs=5)
gs_clf = gs_clf.fit(clean_train_data, train_labels_list)
をした。しかし、私はSelectFdrはここSelectKBestためのマニュアルに従って利用できる特徴選択機能の一つであると考えられるにもかかわらず、このエラーが出る:http://scikit-learn.org/stable/modules/generated/sklearn.feature_selection.SelectKBest.html
Traceback (most recent call last):
File ".../anaconda3/lib/python3.5/site-packages/sklearn/externals/joblib/_parallel_backends.p
y", line 350, in __call__
return self.func(*args, **kwargs)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/externals/joblib/parallel.py", line 1
31, in __call__
return [func(*args, **kwargs) for func, args, kwargs in self.items]
File ".../anaconda3/lib/python3.5/site-packages/sklearn/externals/joblib/parallel.py", line 1
31, in <listcomp>
return [func(*args, **kwargs) for func, args, kwargs in self.items]
File ".../anaconda3/lib/python3.5/site-packages/sklearn/model_selection/_validation.py", line
437, in _fit_and_score
estimator.fit(X_train, y_train, **fit_params)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/pipeline.py", line 257, in fit
Xt, fit_params = self._fit(X, y, **fit_params)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/pipeline.py", line 222, in _fit
**fit_params_steps[name])
File ".../anaconda3/lib/python3.5/site-packages/sklearn/externals/joblib/memory.py", line 362
, in __call__
return self.func(*args, **kwargs)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/pipeline.py", line 589, in _fit_trans
form_one
res = transformer.fit_transform(X, y, **fit_params)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/base.py", line 521, in fit_transform
return self.fit(X, y, **fit_params).transform(X)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/feature_selection/base.py", line 76,
in transform
mask = self.get_support()
File ".../anaconda3/lib/python3.5/site-packages/sklearn/feature_selection/base.py", line 47,
in get_support
mask = self._get_support_mask()
File ".../anaconda3/lib/python3.5/site-packages/sklearn/feature_selection/univariate_selectio
n.py", line 503, in _get_support_mask
scores = _clean_nans(self.scores_)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/feature_selection/univariate_selectio
n.py", line 30, in _clean_nans
scores = as_float_array(scores, copy=True)
File ".../anaconda3/lib/python3.5/site-packages/sklearn/utils/validation.py", line 93, in as_
float_array
return X.astype(return_dtype)
TypeError: float() argument must be a string or a number, not 'SelectFdr'
なぜこのようなことが起こるのか?
ありがとうございます!私はあなたがそれを行うことができるかどうかはわかりませんでした私はちょっと違う別の質問があります。 SelectFdrは偽陽性を減らそうとしますか?偽陰性を減らす機能はありますか?そうでない場合は、パイプライン内でポジティブと見なされるラベルを指定する方法がありますか? – Atirag