title: Cuda, CuDNN installed But Tensorflow can't use the GPU
body: <p>My system is Ubuntu 14.04 on EC2.:</p>
  
  <pre><code>nvidia-smi
  Sun Oct  2 13:35:28 2016       
  +------------------------------------------------------+                       
  | NVIDIA-SMI 352.63     Driver Version: 352.63         |                       
  |-------------------------------+----------------------+----------------------+
  | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
  | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
  |===============================+======================+======================|
  |   0  GRID K520           Off  | 0000:00:03.0     Off |                  N/A |
  | N/A   37C    P0    35W / 125W |     11MiB /  4095MiB |      0%      Default |
  +-------------------------------+----------------------+----------------------+
  
  +-----------------------------------------------------------------------------+
  | Processes:                                                       GPU Memory |
  |  GPU       PID  Type  Process name                               Usage      |
  |=============================================================================|
  |  No running processes found                                                 |
  +-----------------------------------------------------------------------------+
  ubuntu@ip-XXX-XX-XX-990:~$ nvcc -V
  nvcc: NVIDIA (R) Cuda compiler driver
  Copyright (c) 2005-2015 NVIDIA Corporation
  Built on Tue_Aug_11_14:27:32_CDT_2015
  Cuda compilation tools, release 7.5, V7.5.17
  </code></pre>
  
  <p>I Installed CUDA 7.5 and CuDNN 5.1.</p>
  
  <p>I have the proper files in /usr/local/local/lib64 and include folders.</p>
  
  <p>Tensorflow line gives nothing:</p>
  
  <pre><code>    sess = tf.Session(config=tf.ConfigProto(log_device_placement=True))
  
  &gt;&gt;&gt; sess = tf.Session(config=tf.ConfigProto(log_device_placement=True))
  Device mapping: no known devices.
  I tensorflow/core/common_runtime/direct_session.cc:252] Device mapping:
  
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>Please help (Thanks a lot :)).</p>