Tensorflow don't compute, but w/o errors

So I have the following problem:
I have a machine with

  • Ubuntu 18.04.0 LTS
  • Kernel: 4.15.0-54-generic
  • Quadro M6000 (12GB)
  • Intel Xeon CPU E5-1620 v3
  • 64GB Memory

I installed the required nvidia stuff as described in here:
(https://www.tensorflow.org/install/gpu)
following with the install of tensorflow-gpu (1.14.0)

Thu Jul 18 09:21:40 2019 +-----------------------------------------------------------------------------+ | NVIDIA-SMI 418.67 Driver Version: 418.67 CUDA Version: 10.1 | |-------------------------------+----------------------+----------------------+ | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC | | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. | |===============================+======================+======================| | 0 Quadro M6000 On | 00000000:04:00.0 On | Off | | 27% 51C P0 75W / 250W | 393MiB / 12207MiB | 3% Default |

Never less after installing tensorflow
I tried the provide example script:
import tensorflow as tf
print(tf.reduce_sum([2000, 1000]))
but it always returns
Tensor("Sum:0", shape=(), dtype=int32)
–> I expected Sum:3000
So in summary I did not find any errors similar to this and because there is no error message I have no clue where to start

I hope someone can help me
Thanks in advance :grinning: