KNeighborsClassifier错误:未知标签类型:'未知'

时间:2019-04-11 05:03:17

标签: python scikit-learn knn

我正在尝试使用带有以下代码的KNeighborsClassifier进行KNN-

X_train, X_test, y_train, y_test = train_test_split(X_bow, y, test_size=0.30, random_state=42)

neigh = KNeighborsClassifier(n_neighbors=3)
neigh.fit(X_train, y_train)

但是我收到以下错误

ValueError: Unknown label type: 'unknown'

X_train的类型为scipy.sparse.csr.csr_matrix,y_train的类型为numpy.ndarray。

这是我得到的详细错误。为什么会出现此错误?

ValueError                                Traceback (most recent call last)
<ipython-input-278-97b47c930597> in <module>
     10 
     11 neigh = KNeighborsClassifier(n_neighbors=3)
---> 12 neigh.fit(X_train, y_train)

c:\users\kishore\appdata\local\programs\python\python36\lib\site-packages\sklearn\neighbors\base.py in fit(self, X, y)
    903             self.outputs_2d_ = True
    904 
--> 905         check_classification_targets(y)
    906         self.classes_ = []
    907         self._y = np.empty(y.shape, dtype=np.int)

c:\users\kishore\appdata\local\programs\python\python36\lib\site-packages\sklearn\utils\multiclass.py in check_classification_targets(y)
    169     if y_type not in ['binary', 'multiclass', 'multiclass-multioutput',
    170                       'multilabel-indicator', 'multilabel-sequences']:
--> 171         raise ValueError("Unknown label type: %r" % y_type)
    172 
    173 

ValueError: Unknown label type: 'unknown'

编辑1:

我的Y是-array([0,1,0,...,1,1,1],dtype = object)

我的X是类型为的<5600x6031稀疏矩阵     带有压缩稀疏行格式的586188个存储元素>

1 个答案:

答案 0 :(得分:1)

因此,问题在于您的y是object类型,而sklearn无法识别。

在将变量传递到分类器之前,可以使用y=y.astype('int')