升级gluoncv到0.8版（用conda install解决找不到chardet的问题）

用pip install 和 conda install 到底有什么不同，很多时候真难以说清楚，非常明确的是，安装 的位置“有时”确实不同。这次gluoncv升级就碰到了。

(1) 卸载旧的gluoncv

pip uninstall gluoncv

(2) 然后在这里把最新的gluoncv下载下来，

https://github.com/dmlc/gluon-cv

解压后切换到目录下用python setup.py install命令进行安装（我的mxnet-cu101安装 在mx36gpu环境）

(mx36gpu) D:\mXNet\gluon-cv-master>python setup.py install

安装到最后，Processing dependencies时居然报错了，

gluoncv 0.8.0 is already the active version in easy-install.pth
​
Installed d:\anaconda3\envs\mx36gpu\lib\site-packages\gluoncv-0.8.0-py3.6.egg
Processing dependencies for gluoncv==0.8.0
error: [Errno 2] No such file or directory: 'd:\\anaconda3\\envs\\mx36gpu\\lib\\site-packages\\chardet-3.0.4.dist-info\\METADATA'

（3）用conda install 安装 chardet

然后我用pip install chardet时，却被告知已经被安装上了

(mx36gpu) D:\mXNet\gluon-cv-master>pip install chardet
Requirement already satisfied: chardet in c:\users\administrator\appdata\roaming\python\python36\site-packages (3.0.4)

回想起以前安装不少文件包时，一般都会使用 anaconda这个channel，比如

conda install -c anaconda \

所以我尝试这样安装

(mx36gpu) D:\mXNet\gluon-cv-master>conda install -c anaconda chardet
Collecting package metadata (current_repodata.json): done
Solving environment: done
## Package Plan ##
  environment location: d:\Anaconda3\envs\mx36gpu
  added / updated specs:
    - chardet
The following packages will be downloaded:
    package                    |            build
    ---------------------------|-----------------
    certifi-2020.6.20          |           py36_0         160 KB  anaconda
    chardet-3.0.4              |        py36_1003         215 KB  anaconda
    ------------------------------------------------------------
                                           Total:         375 KB
The following NEW packages will be INSTALLED:
  chardet            anaconda/win-64::chardet-3.0.4-py36_1003
The following packages will be SUPERSEDED by a higher-priority channel:
  ca-certificates                                 pkgs/main --> anaconda
  certifi                                         pkgs/main --> anaconda
  openssl                                         pkgs/main --> anaconda
Proceed ([y]/n)? y
Downloading and Extracting Packages
certifi-2020.6.20    | 160 KB    | ######################################| 100%
chardet-3.0.4        | 215 KB    | ######################################| 100%
Preparing transaction: done
Verifying transaction: done
Executing transaction: done

(4) 最后重新setup一下gluoncv，成功。大致看了下，检查了很多包的依赖关系。

(mx36gpu) D:\mXNet\gluon-cv-master>python setup.py install
running install
running bdist_egg
running egg_info
writing gluoncv.egg-info\PKG-INFO
......
gluoncv 0.8.0 is already the active version in easy-install.pth
​
Installed d:\anaconda3\envs\mx36gpu\lib\site-packages\gluoncv-0.8.0-py3.6.egg
Processing dependencies for gluoncv==0.8.0
Searching for scipy==1.5.0
Best match: scipy 1.5.0
Adding scipy 1.5.0 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for Pillow==7.1.2
Best match: Pillow 7.1.2
Adding Pillow 7.1.2 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for portalocker==1.7.0
Best match: portalocker 1.7.0
Adding portalocker 1.7.0 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for matplotlib==3.2.2
Best match: matplotlib 3.2.2
Adding matplotlib 3.2.2 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for requests==2.18.4
Best match: requests 2.18.4
Adding requests 2.18.4 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for tqdm==4.47.0
Best match: tqdm 4.47.0
Adding tqdm 4.47.0 to easy-install.pth file
Installing tqdm-script.py script to d:\Anaconda3\envs\mx36gpu\Scripts
Installing tqdm.exe script to d:\Anaconda3\envs\mx36gpu\Scripts
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for numpy==1.16.6
Best match: numpy 1.16.6
Adding numpy 1.16.6 to easy-install.pth file
Installing f2py-script.py script to d:\Anaconda3\envs\mx36gpu\Scripts
Installing f2py.exe script to d:\Anaconda3\envs\mx36gpu\Scripts
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for pywin32==228
Best match: pywin32 228
Adding pywin32 228 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for cycler==0.10.0
Best match: cycler 0.10.0
Adding cycler 0.10.0 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for python-dateutil==2.8.1
Best match: python-dateutil 2.8.1
Adding python-dateutil 2.8.1 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for pyparsing==2.4.7
Best match: pyparsing 2.4.7
Adding pyparsing 2.4.7 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for kiwisolver==1.2.0
Best match: kiwisolver 1.2.0
Adding kiwisolver 1.2.0 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for chardet==3.0.4
Best match: chardet 3.0.4
Adding chardet 3.0.4 to easy-install.pth file
Installing chardetect-script.py script to d:\Anaconda3\envs\mx36gpu\Scripts
Installing chardetect.exe script to d:\Anaconda3\envs\mx36gpu\Scripts
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for urllib3==1.22
Best match: urllib3 1.22
Adding urllib3 1.22 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for certifi==2020.6.20
Best match: certifi 2020.6.20
Adding certifi 2020.6.20 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for idna==2.6
Best match: idna 2.6
Adding idna 2.6 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Searching for six==1.15.0
Best match: six 1.15.0
Adding six 1.15.0 to easy-install.pth file
​
Using d:\anaconda3\envs\mx36gpu\lib\site-packages
Finished processing dependencies for gluoncv==0.8.0
​
(mx36gpu) D:\mXNet\gluon-cv-master>