OP_REQUIRES failed at xla_ops.cc:301 : Internal: libdevice not found at ./libdevice.10.bc

题目限制100字，一个较为完整的报错信息应该是

W tensorflow/compiler/xla/service/gpu/nvptx_compiler.cc:73] Can't find libdevice directory ${CUDA_DIR}/nvvm/libdevice. This may result in compilation or runtime failures, if the program we try to run uses routines from libdevice.
W tensorflow/compiler/xla/service/gpu/nvptx_compiler.cc:74] Searched for CUDA in the following directories:
W tensorflow/compiler/xla/service/gpu/nvptx_compiler.cc:77]   ./cuda_sdk_lib
W tensorflow/compiler/xla/service/gpu/nvptx_compiler.cc:77]   C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v11.2
W tensorflow/compiler/xla/service/gpu/nvptx_compiler.cc:77]   .
W tensorflow/compiler/xla/service/gpu/nvptx_compiler.cc:79] You can choose the search directory by setting xla_gpu_cuda_data_dir in HloModule's DebugOptions.  For most apps, setting the environment variable XLA_FLAGS=--xla_gpu_cuda_data_dir=/path/to/cuda will work.
W tensorflow/compiler/xla/service/gpu/llvm_gpu_backend/gpu_backend_lib.cc:328] libdevice is required by this HLO module but was not found at ./libdevice.10.bc
W tensorflow/core/framework/op_kernel.cc:1767] OP_REQUIRES failed at xla_ops.cc:301 : Internal: libdevice not found at ./libdevice.10.bc

这个问题出现的原因有两个：
1、没有安装cudatoolkit、cuDNN这些；
2、在安装的时候更改路径，没有安装到默认的C:/Program Files/NVIDIA GPU Computing路径下。
针对第一个原因，没什么好说的，安装好即可；
针对第二个原因，则需要配置环境变量。

这里注意到报错中核心的一句

You can choose the search directory by setting xla_gpu_cuda_data_dir in HloModule's DebugOptions.  For most apps, setting the environment variable XLA_FLAGS=--xla_gpu_cuda_data_dir=/path/to/cuda will work.

因此，在电脑系统中添加环境变量即可，环境变量名为

XLA_FLAGS

变量值为（具体路径当然需要根据实际情况进行修改（一句唠叨话））

--xla_gpu_cuda_data_dir='E:\CUDA\NVIDIA GPU Computing Toolkit\CUDA\v11.2'

注意两点：
1、此处的–xla_gpu_cuda_data_dir不可省，等号右边的单引号也不可省略；
2、在满足第一点的基础上，在电脑系统中配置环境变量，或是通过pycharm的设置等配置环境变量都可。

补充：
在stackoverflow论坛中找到的关于该问题的单双引号的表述

参考网址：

1. 标题：设置python环境变量的三种方法（pycharm）
   网址：https://www.iotword.com/5087.html
2. 标题：TensorFlow libdevice not found. Why is it not found in the searched path?
   网址：https://stackoverflow.com/questions/68614547/tensorflow-libdevice-not-found-why-is-it-not-found-in-the-searched-path