我正在尝试导入以下内容：

from sklearn.model_selection import train_test_split

并出现以下错误，这是堆栈跟踪：

ImportError                               Traceback (most recent call last)
<ipython-input-1-bdd2a2f20673> in <module>
      2 import pandas as pd
      3 from sklearn.model_selection import train_test_split
----> 4 from sklearn.tree import DecisionTreeclassifier
      5 from sklearn.metrics import accuracy_score
      6 from sklearn import tree

~/.local/lib/python3.6/site-packages/sklearn/tree/__init__.py in <module>
      4 """
      5 
----> 6 from ._classes import BaseDecisionTree
      7 from ._classes import DecisionTreeclassifier
      8 from ._classes import DecisionTreeRegressor

~/.local/lib/python3.6/site-packages/sklearn/tree/_classes.py in <module>
     38 from ..utils.validation import check_is_fitted
     39 
---> 40 from ._criterion import Criterion
     41 from ._splitter import Splitter
     42 from ._tree import DepthFirstTreeBuilder

~/.local/lib/python3.6/site-packages/sklearn/tree/_splitter.pxd in init sklearn.tree._criterion()

~/.local/lib/python3.6/site-packages/sklearn/tree/_tree.pxd in init sklearn.tree._splitter()

~/.local/lib/python3.6/site-packages/sklearn/neighbors/_quad_tree.pxd in init sklearn.tree._tree()

~/.local/lib/python3.6/site-packages/sklearn/neighbors/__init__.py in <module>
     15 from ._kde import KernelDensity
     16 from ._lof import LocalOutlierFactor
---> 17 from ._nca import NeighborhoodComponentsAnalysis
     18 from ._base import VALID_METRICS,VALID_METRICS_SPARSE
     19 

~/.local/lib/python3.6/site-packages/sklearn/neighbors/_nca.py in <module>
     20 from ..base import BaseEstimator,TransformerMixin
     21 from ..preprocessing import LabelEncoder
---> 22 from ..decomposition import PCA
     23 from ..utils.multiclass import check_classification_targets
     24 from ..utils.random import check_random_state

~/.local/lib/python3.6/site-packages/sklearn/decomposition/__init__.py in <module>
     17 from ._factor_analysis import FactorAnalysis
     18 from ..utils.extmath import randomized_svd
---> 19 from ._online_lda import LatentDirichletallocation
     20 
     21 __all__ = ['DictionaryLearning',ImportError: cannot import name 'LatentDirichletallocation'

实际上我正在尝试导入：

from sklearn.cross_validation import train_test_split

哪个给了我以下错误：

ModuleNotFoundError                       Traceback (most recent call last)
<ipython-input-2-9ebede864c4d> in <module>
      1 import numpy as np
      2 import pandas as pd
----> 3 from sklearn.cross_validation import train_test_split
      4 from sklearn.tree import DecisionTreeclassifier
      5 from sklearn.metrics import accuracy_score

ModuleNotFoundError: No module named 'sklearn.cross_validation'

因此，正如this帖子中回答的那样，我使用sklearn.model_selection而不是sklearn.cross_validation。但这仍然是一个错误。

我正在使用python 3.6.8。