问题记录——Intel MKL FATAL ERROR: Cannot load mkl_intel_thread.dll.

今天遇到的一个问题：

然后在https://conda.io/projects/conda/en/latest/user-guide/troubleshooting.html#numpy-mkl-library-load-failed
找到了解决方法。

它上面说到有两种情况导致这个问题发生：

1.没有activate你的环境
2.Another software vendor has installed MKL or Intel OpenMP (libiomp5md.dll) files into the C:\Windows\System32 folder. These files are being loaded before Anaconda’s and they’re not compatible.
就是你通过别的地方安装了MKL或者Intel OpenMP在C:\Windows\System32文件夹中。

然后他的解决办法是（英语水平太差了，勉强看的懂，说不清，遇到同样问题的人试着看吧）：
Remove any MKL-related files from C:\Windows\System32. We recommend renaming them to add .bak to the filename to effectively hide them. Observe if any other software breaks. Try moving the DLL files alongside the .exe of the software that broke. If it works again, you can keep things in the moved state - Anaconda doesn’t need MKL in System32, and no other software should need it either. If you identify software that is installing software here, please contact the creators of that software. Inform them that their practice of installing MKL to a global location is fragile and is breaking other people’s software and wasting a lot of time. See the list of guilty parties below.

You may try a special DLL loading mode that Anaconda builds into Python. This changes the DLL search path from system32 first to system32 as another entry on PATH, allowing libraries in your conda environment to be found before the libraries in system32. Control of this feature is done with environment variables. Only python builds beyond these builds will react to these environment variables:

Python 2.7.15 build 14
Python 3.6.8 build 7
Python 3.7.2 build 8

To update Python from the defaults channel:

conda update -c defaults python

Control environment variables:

• CONDA_DLL_SEARCH_MODIFICATION_ENABLE
• CONDA_DLL_SEARCH_MODIFICATION_DEBUG
• CONDA_DLL_SEARCH_MODIFICATION_NEVER_ADD_WINDOWS_DIRECTORY
• CONDA_DLL_SEARCH_MODIFICATION_NEVER_ADD_CWD

These should be set to a value of 1 to enable them. For example, in an anaconda prompt terminal:

set CONDA_DLL_SEARCH_MODIFICATION_ENABLE=1