# Tensorflow does not detect GPU

## post by R_G on May 19, 2021

Hi,

I have installed Lambda stack on ubuntu 20.04 and RTX 3090. Tensorflow 2.4.1 does not detect gpu. What I understand is that cudnn8 is not installed. Here is what i got:

```python
tf.config.experimental.list_physical_devices('gpu')
```

```
I tensorflow/stream_executor/platform/default/dso_loader.cc:49] Successfully opened dynamic library libcusparse.so.11

2021-05-19 09:48:02.489196: W tensorflow/stream_executor/platform/default/dso_loader.cc:60] Could not load dynamic library ‘libcudnn.so.8’; dlerror: libcudnn.so.8: cannot open shared object file: No such file or directory

2021-05-19 09:48:02.489202: W tensorflow/core/common_runtime/gpu/gpu_device.cc:1757] Cannot dlopen some GPU libraries. Please make sure the missing libraries mentioned above are installed properly if you would like to use GPU. Follow the guide at [قم بتثبيت TensorFlow مع النقطة](https://www.tensorflow.org/install/gpu) for how to download and setup the required libraries for your platform.

Skipping registering GPU devices…
```

## post by rohan1198 on May 24, 2021

Are you using a Python Virtual environment?

If so, you’ll need to copy over a few files from the Lambda installation to your venv.

More specifically, all the libcudnn packages from /usr/lib/python3/dist-packages/tensorflow.

Just copy them over to venv_path/lib/site-packages/tensorflow

Reboot.