今天在用pytorch是报错如下：
OMP: Error #15: Initializing libiomp5md.dll, but found libiomp5md.dll already initialized.
OMP: Hint This means that multiple copies of the OpenMP runtime have been linked into the program. That is dangerous, since it can degrade performance or cause incorrect results. The best thing to do is to ensure that only a single OpenMP runtime is linked into the process, e.g. by avoiding static linking of the OpenMP runtime in any library. As an unsafe, unsupported, undocumented workaround you can set the environment variable KMP_DUPLICATE_LIB_OK=TRUE to allow the program to continue to execute, but that may cause crashes or silently produce incorrect results. For more information, please see http://www.intel.com/software/products/support/.
1. 解决办法
用的是pytorch ==1.5，所以试着降低一下版本为1.2
完美解决。
2.网上也有用
import os
os.environ["KMP_DUPLICATE_LIB_OK"]="TRUE"
但是这个不能根本性质解决问题，只是忽略了报错和注意提醒，关键还是用1的办法。