本文整理汇总了Python中sklearn.compose.ColumnTransformer.get_feature_names方法的典型用法代码示例。如果您正苦于以下问题：Python ColumnTransformer.get_feature_names方法的具体用法？Python ColumnTransformer.get_feature_names怎么用？Python ColumnTransformer.get_feature_names使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类sklearn.compose.ColumnTransformer的用法示例。
在下文中一共展示了ColumnTransformer.get_feature_names方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_column_transformer_get_feature_names
# 需要导入模块: from sklearn.compose import ColumnTransformer [as 别名]
# 或者: from sklearn.compose.ColumnTransformer import get_feature_names [as 别名]
def test_column_transformer_get_feature_names():
X_array = np.array([[0., 1., 2.], [2., 4., 6.]]).T
ct = ColumnTransformer([('trans', Trans(), [0, 1])])
# raise correct error when not fitted
assert_raises(NotFittedError, ct.get_feature_names)
# raise correct error when no feature names are available
ct.fit(X_array)
assert_raise_message(AttributeError,
"Transformer trans (type Trans) does not provide "
"get_feature_names", ct.get_feature_names)
# working example
X = np.array([[{'a': 1, 'b': 2}, {'a': 3, 'b': 4}],
[{'c': 5}, {'c': 6}]], dtype=object).T
ct = ColumnTransformer(
[('col' + str(i), DictVectorizer(), i) for i in range(2)])
ct.fit(X)
assert_equal(ct.get_feature_names(), ['col0__a', 'col0__b', 'col1__c'])
# passthrough transformers not supported
ct = ColumnTransformer([('trans', 'passthrough', [0, 1])])
ct.fit(X)
assert_raise_message(
NotImplementedError, 'get_feature_names is not yet supported',
ct.get_feature_names)
ct = ColumnTransformer([('trans', DictVectorizer(), 0)],
remainder='passthrough')
ct.fit(X)
assert_raise_message(
NotImplementedError, 'get_feature_names is not yet supported',
ct.get_feature_names)
# drop transformer
ct = ColumnTransformer(
[('col0', DictVectorizer(), 0), ('col1', 'drop', 1)])
ct.fit(X)
assert_equal(ct.get_feature_names(), ['col0__a', 'col0__b'])