Tensorflow 2.3.0 CUDA Toolkit 10.1 版不使用 GPU

Question

我的 RTX2070 gpu 有 tensorflow 2.0 workig。我做了一个 Windows 更新，所以我可以使用 tf-nightly。不喜欢它所以卸载它并重新安装tensorflow 2.3.0。运行以前在 GPU 上运行良好的 Python 代码，但它没有使用 GPU。尝试了很多东西。最后才重新开始。重新安装 Anaconda，创建新环境。卸载 Cuda toolkit 10.1 并重新安装。在目录 c:\Tools 中安装了 cuDnn SDK 7.6。检查路径环境变量以包含

C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.1\bin;
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.1\extras\CUPTI\lib64;
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v10.1\include;
C:\tools\cuda\bin;%PATH%
       #then ran this code:
import tensorflow as tf
from tensorflow.python.client import device_lib
print(device_lib.list_local_devices())
print(tf.__version__)
print("Num GPUs Available: ", len(tf.config.experimental.list_physical_devices('GPU')))
tf.test.is_gpu_available()
     #I get the result
[name: "/device:CPU:0"
device_type: "CPU"
memory_limit: 268435456
locality {
}
incarnation: 15177607927005893519
, name: "/device:XLA_CPU:0"
device_type: "XLA_CPU"
memory_limit: 17179869184
locality {
}
incarnation: 4640072765546557805
physical_device_desc: "device: XLA_CPU device"
, name: "/device:XLA_GPU:0"
device_type: "XLA_GPU"
memory_limit: 17179869184
locality {
}
incarnation: 16675502319763286567
physical_device_desc: "device: XLA_GPU device"
]
2.3.0
Num GPUs Available:  0

False

tensorflow still does not use GPU. What an I missing? 

also same problem using python 3.7.0 and same problem using tensorflow 2.0.0

Answer 1

我发现如果在我的工作环境中使用 conda 运行 conda install cudnn==7.6.4 与 CUDA 10.1.0 一起使用时，我可以让 tensorflow 识别 GPU，在 anaconda 提示符下生成的消息是：

Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Collecting package metadata (repodata.json): done
Solving environment: done

## Package Plan ##

  environment location: C:\Users\tfuser\anaconda3\envs\tf

  added / updated specs:
    - cudnn==7.6.4


The following packages will be downloaded:

    package                    |            build
    ---------------------------|-----------------
    cudnn-7.6.4                |       cuda10.1_0       179.3 MB
    ------------------------------------------------------------
                                           Total:       179.3 MB

The following NEW packages will be INSTALLED:

  cudatoolkit        pkgs/main/win-64::cudatoolkit-10.1.243-h74a9793_0
  cudnn              pkgs/main/win-64::cudnn-7.6.4-cuda10.1_0


Proceed ([y]/n)? y
The following packages will be downloaded:
 cudnn-7.6.4                |       cuda10.1_0       179.3 MB
The following NEW packages will be INSTALLED:

  cudatoolkit        pkgs/main/win-64::cudatoolkit-10.1.243-h74a9793_0
  cudnn              pkgs/main/win-64::cudnn-7.6.4-cuda10.1_0


Proceed ([y]/n)? y
Downloading and Extracting Packages
cudnn-7.6.4          | 179.3 MB  |
Preparing transaction: doneVerifying transaction: done
Executing transaction: done