关于sklearn 0.18中的坑——ImportError: cannot import name 'comb'

问题描述：

Traceback (most recent call last):
  File "C:/Users/Cjc/PycharmProjects/model/鸢尾花分类.py", line 4, in <module>
    import mglearn
  File "C:\App\Anaconda3\envs\model\lib\site-packages\mglearn\__init__.py", line 1, in <module>
    from . import plots
  File "C:\App\Anaconda3\envs\model\lib\site-packages\mglearn\plots.py", line 1, in <module>
    from .plot_linear_svc_regularization import plot_linear_svc_regularization
  File "C:\App\Anaconda3\envs\model\lib\site-packages\mglearn\plot_linear_svc_regularization.py", line 3, in <module>
    from sklearn.svm import LinearSVC
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\svm\__init__.py", line 13, in <module>
    from .classes import SVC, NuSVC, SVR, NuSVR, OneClassSVM, LinearSVC, \
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\svm\classes.py", line 6, in <module>
    from ..linear_model.base import LinearClassifierMixin, SparseCoefMixin, \
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\linear_model\__init__.py", line 15, in <module>
    from .least_angle import (Lars, LassoLars, lars_path, LarsCV, LassoLarsCV,
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\linear_model\least_angle.py", line 25, in <module>
    from ..model_selection import check_cv
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\model_selection\__init__.py", line 1, in <module>
    from ._split import BaseCrossValidator
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\model_selection\_split.py", line 25, in <module>
    from scipy.misc import comb
ImportError: cannot import name 'comb'

Traceback (most recent call last):
  File "C:/Users/Cjc/PycharmProjects/model/鸢尾花分类.py", line 4, in <module>
    import mglearn
  File "C:\App\Anaconda3\envs\model\lib\site-packages\mglearn\__init__.py", line 1, in <module>
    from . import plots
  File "C:\App\Anaconda3\envs\model\lib\site-packages\mglearn\plots.py", line 1, in <module>
    from .plot_linear_svc_regularization import plot_linear_svc_regularization
  File "C:\App\Anaconda3\envs\model\lib\site-packages\mglearn\plot_linear_svc_regularization.py", line 3, in <module>
    from sklearn.svm import LinearSVC
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\svm\__init__.py", line 13, in <module>
    from .classes import SVC, NuSVC, SVR, NuSVR, OneClassSVM, LinearSVC, \
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\svm\classes.py", line 6, in <module>
    from ..linear_model.base import LinearClassifierMixin, SparseCoefMixin, \
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\linear_model\__init__.py", line 15, in <module>
    from .least_angle import (Lars, LassoLars, lars_path, LarsCV, LassoLarsCV,
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\linear_model\least_angle.py", line 25, in <module>
    from ..model_selection import check_cv
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\model_selection\__init__.py", line 1, in <module>
    from ._split import BaseCrossValidator
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\model_selection\_split.py", line 35, in <module>
    from ..gaussian_process.kernels import Kernel as GPKernel
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\gaussian_process\__init__.py", line 13, in <module>
    from .gpr import GaussianProcessRegressor
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\gaussian_process\gpr.py", line 15, in <module>
    from sklearn.gaussian_process.kernels import RBF, ConstantKernel as C
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\gaussian_process\kernels.py", line 30, in <module>
    from ..metrics.pairwise import pairwise_kernels
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\metrics\__init__.py", line 33, in <module>
    from . import cluster
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\metrics\cluster\__init__.py", line 8, in <module>
    from .supervised import adjusted_mutual_info_score
  File "C:\App\Anaconda3\envs\model\lib\site-packages\sklearn\metrics\cluster\supervised.py", line 21, in <module>
    from scipy.misc import comb
ImportError: cannot import name 'comb'

解决方法：
修改lib\site-packages\sklearn\model_selection\_split.py中from scipy.misc import comb为from scipy.special import comb
修改lib\site-packages\sklearn\metrics\cluster\supervised.py中from scipy.misc import comb为from scipy.special import comb