模块'Orange'没有属性'feature'

Question

我可以导入Orange但是当我尝试运行以下内容时：

import Orange as o
import numpy as np

auc_array = np.asarray(auction[nf])
auc = o.data.Table(auc_array)
imputer = o.feature.imputation.ModelConstructor()
imputer.learner_continuous = imputer.learner_discrete = Orange.classification.tree.TreeLearner(min_subset=20)
imputer = imputer(auc)
print(auc)

我明白了：

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-21-1b6636bf45a4> in <module>()
      4 auc_array = np.asarray(auction[nf])
      5 auc = o.data.Table(auc_array)
----> 6 imputer = o.feature.imputation.ModelConstructor()
      7 imputer.learner_continuous = imputer.learner_discrete = Orange.classification.tree.TreeLearner(min_subset=20)
      8 imputer = imputer(auc)

AttributeError: module 'Orange' has no attribute 'feature'

我也尝试导入Orange.feature，但代码仍无效：

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-23-78641fe044ef> in <module>()
      1 import Orange as o
----> 2 import Orange.feature
      3 import numpy as np
      4 
      5 auc_array = np.asarray(auction[nf])

ImportError: No module named 'Orange.feature'