python sklearn找不到指定模块

在 import sklearn.manifold时出现 ImportError: DLL load failed：找不到指定的模块，具体如下：

Traceback (most recent call last):
  File "", line 1, in 
  File "C:UsersuserAppDataLocalProgramspythonPython36libsite-packagessklearnmanifold__init__.py", line 5, in 
    from .locally_linear import locally_linear_embedding, LocallyLinearEmbedding
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearnmanifoldlocally_linear.py", line 17, in 
    from ..neighbors import NearestNeighbors
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearn
eighbors__init__.py", line 9, in 
    from .graph import kneighbors_graph, radius_neighbors_graph
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearn
eighborsgraph.py", line 7, in 
    from .base import KNeighborsMixin, RadiusNeighborsMixin
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearn
eighborsase.py", line 18, in 
    from ..metrics import pairwise_distances
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearnmetrics__init__.py", line 35, in 
    from . import cluster
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearnmetricscluster__init__.py", line 20, in 
    from .unsupervised import silhouette_samples
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearnmetricsclusterunsupervised.py", line 12, in 
    from ..pairwise import pairwise_distances
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagessklearnmetricspairwise.py", line 30, in 
    from .pairwise_fast import _chi2_kernel_fast, _sparse_manhattan
ImportError: DLL load failed: 找不到指定的模块。

解决方法：

在保证scipy和numpy成功安装的条件下，并且安装了pip后使用命令 pip install -U scikit-learn 更新一下即可。

若遇到如下问题：

Exception:
Traceback (most recent call last):
  File "C:UsersuserAppDataLocalProgramsPythonPython36libshutil.py", line 387, in _rmtree_unsafe
    os.unlink(fullname)
PermissionError: [WinError 5] 拒绝访问。: 'C:UsersuserAppDataLocalTemppip-njirl_1q-uninstallusersuserappdatalocalprogramspythonpython36libsite-packagessklearnfeature_extraction_hashing.cp36-win_amd64.pyd'
 
During handling of the above exception, another exception occurred:
 
Traceback (most recent call last):
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespipasecommand.py", line 215, in main
    status = self.run(options, args)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespipcommandsinstall.py", line 342, in run
    prefix=options.prefix_path,
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespipeqeq_set.py", line 795, in install
    requirement.commit_uninstall()
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespipeqeq_install.py", line 767, in commit_uninstall
    self.uninstalled.commit()
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespipeqeq_uninstall.py", line 142, in commit
    rmtree(self.save_dir)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespip_vendoretrying.py", line 49, in wrapped_f
    return Retrying(*dargs, **dkw).call(f, *args, **kw)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespip_vendoretrying.py", line 212, in call
    raise attempt.get()
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespip_vendoretrying.py", line 247, in get
    six.reraise(self.value[0], self.value[1], self.value[2])
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespip_vendorsix.py", line 686, in reraise
    raise value
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespip_vendoretrying.py", line 200, in call
    attempt = Attempt(fn(*args, **kwargs), attempt_number, False)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespiputils__init__.py", line 102, in rmtree
    οnerrοr=rmtree_errorhandler)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libshutil.py", line 494, in rmtree
    return _rmtree_unsafe(path, onerror)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libshutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libshutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  File "C:UsersuserAppDataLocalProgramsPythonPython36libshutil.py", line 384, in _rmtree_unsafe
    _rmtree_unsafe(fullname, onerror)
  [Previous line repeated 7 more times]
  File "C:UsersuserAppDataLocalProgramsPythonPython36libshutil.py", line 389, in _rmtree_unsafe
    onerror(os.unlink, fullname, sys.exc_info())
  File "C:UsersuserAppDataLocalProgramsPythonPython36libsite-packagespiputils__init__.py", line 114, in rmtree_errorhandler
    func(path)
PermissionError: [WinError 5] 拒绝访问。: 'C:UsersuserAppDataLocalTemppip-njirl_1q-uninstallusersuserappdatalocalprogramspythonpython36libsite-packagessklearnfeature_extraction_hashing.cp36-win_amd64.pyd' 

使用 pip install --user package_name命令即可解决。

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