anaconda的scikit-learn报错It seems that scikit-learn has not been built

我们在导入sklearn时往往会报错。

import sklearn
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
  File "sklearn/__init__.py", line 37, in <module>
    from . import __check_build
  File "sklearn/__check_build/__init__.py", line 46, in <module>
    raise_build_error(e)
  File "sklearn/__check_build/__init__.py", line 41, in raise_build_error
    %s""" % (e, local_dir, ''.join(dir_content).strip(), msg))
ImportError: No module named _check_build
___________________________________________________________________________
Contents of sklearn/__check_build:
__init__.py               __init__.pyc              _check_build.c
_check_build.pyx          setup.py                  setup.pyc
___________________________________________________________________________
It seems that scikit-learn has not been built correctly.  

If you have installed scikit-learn from source, please do not forget
to build the package before using it: run `python setup.py install` or
`make` in the source directory.  

If you have used an installer, please check that it is suited for your
Python version, your operating system and your platform.

折腾了一下午之后的解决方案：
1.shadowsocksFQ，解决pip官网下载速度问题。
2.用pip在anaconda Scripts目录中卸载numpy,scipy,matplotlib,skicit-learn相关。
命令：pip uninstall numpy
3.在anaconda Scripts目录中重装numpy,scipy,matplotlib，最后安装skicit-learn。
命令：pip install numpy

成功解决问题，开心到飞起。

https://blog.csdn.net/wyc12306/article/details/54564136

https://www.cnblogs.com/eastmount/p/5052871.html