cannot import name '_validate_lengths' from 'numpy.lib.arraypad'_skimage numpy1.16

在import skimage的时候出错：

>>> import skimage
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/AI/AN/lib/python3.7/site-packages/skimage/__init__.py", line 157, in <module>
    from .util.dtype import *
  File "/opt/AI/AN/lib/python3.7/site-packages/skimage/util/__init__.py", line 8, in <module>
    from .arraycrop import crop
  File "/opt/AI/AN/lib/python3.7/site-packages/skimage/util/arraycrop.py", line 8, in <module>
    from numpy.lib.arraypad import _validate_lengths
ImportError: cannot import name '_validate_lengths' from 'numpy.lib.arraypad' (/opt/AI/AN/lib/python3.7/site-packages/numpy/lib

原因因为与numpy版本不匹配，我的numpy是1.16

可以降低numpy的版本，也可以提高skimage的版本，我最终用的后者，前者会报错：

ValueError: numpy.ufunc has the wrong size, try recompiling. Expected 192, got 216

解决方法：

1）查看版本：

[root@localhost datasets]# pip install scikit-image==9999
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
ERROR: Could not find a version that satisfies the requirement scikit-image==9999 (from versions: 0.7.2, 0.8.0, 0.8.1, 0.8.2, 0.9.0, 0.9.1, 0.9.3, 0.10.0, 0.10.1, 0.11.2, 0.11.3, 0.12.0, 0.12.1, 0.12.2, 0.12.3, 0.13.0, 0.13.1, 0.14.0, 0.14.1, 0.14.2, 0.14.3, 0.14.4, 0.14.5, 0.15.0, 0.16.1, 0.16.2)
ERROR: No matching distribution found for scikit-image==9999

2）安装最新的

[root@localhost datasets]# pip install scikit-image==0.16.2
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting scikit-image==0.16.2
  Downloading https://pypi.tuna.tsinghua.edu.cn/packages/dc/48/454bf836d302465475e02bc0468b879302145b07a005174c409a5b5869c7/scikit_image-0.16.2-cp37-cp37m-manylinux1_x86_64.whl (26.5MB)
     |████████████████████████████████| 26.5MB 1.8MB/s 
Requirement already satisfied: matplotlib!=3.0.0,>=2.0.0 in /opt/AI/AN/lib/python3.7/site-packages (from scikit-image==0.16.2) (2.2.3)
Requirement already satisfied: scipy>=0.19.0 in /opt/AI/AN/lib/python3.7/site-packages (from scikit-image==0.16.2) (1.1.0)
Requirement already satisfied: networkx>=2.0 in /opt/AI/AN/lib/python3.7/site-packages (from scikit-image==0.16.2) (2.1)
Requirement already satisfied: imageio>=2.3.0 in /opt/AI/AN/lib/python3.7/site-packages (from scikit-image==0.16.2) (2.4.1)
Requirement already satisfied: PyWavelets>=0.4.0 in /opt/AI/AN/lib/python3.7/site-packages (from scikit-image==0.16.2) (1.0.0)
Requirement already satisfied: pillow>=4.3.0 in /opt/AI/AN/lib/python3.7/site-packages (from scikit-image==0.16.2) (5.2.0)
Requirement already satisfied: numpy>=1.7.1 in /opt/AI/AN/lib/python3.7/site-packages (from matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (1.16.0)
Requirement already satisfied: cycler>=0.10 in /opt/AI/AN/lib/python3.7/site-packages (from matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (0.10.0)
Requirement already satisfied: pyparsing!=2.0.4,!=2.1.2,!=2.1.6,>=2.0.1 in /opt/AI/AN/lib/python3.7/site-packages (from matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (2.4.5)
Requirement already satisfied: python-dateutil>=2.1 in /opt/AI/AN/lib/python3.7/site-packages (from matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (2.7.3)
Requirement already satisfied: pytz in /opt/AI/AN/lib/python3.7/site-packages (from matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (2018.5)
Requirement already satisfied: six>=1.10 in /opt/AI/AN/lib/python3.7/site-packages (from matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (1.13.0)
Requirement already satisfied: kiwisolver>=1.0.1 in /opt/AI/AN/lib/python3.7/site-packages (from matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (1.0.1)
Requirement already satisfied: decorator>=4.1.0 in /opt/AI/AN/lib/python3.7/site-packages (from networkx>=2.0->scikit-image==0.16.2) (4.3.0)
Requirement already satisfied: setuptools in /opt/AI/AN/lib/python3.7/site-packages (from kiwisolver>=1.0.1->matplotlib!=3.0.0,>=2.0.0->scikit-image==0.16.2) (41.0.0)
Installing collected packages: scikit-image
  Found existing installation: scikit-image 0.14.0
    Uninstalling scikit-image-0.14.0:
      Successfully uninstalled scikit-image-0.14.0
Successfully installed scikit-image-0.16.2

3）试一下：

[root@localhost datasets]# python
Python 3.7.0 (default, Jun 28 2018, 13:15:42) 
[GCC 7.2.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import skimage
>>> 

完全ok