No GPU detected

I submitted a job and it runs fine. However, it is slow and I found that it is not utilizing GPUs.

#!/bin/bash -l
#SBATCH -o out
#SBATCH -e err
conda activate tensorflow-gpu
python train.py

After the the job was submitted, I logged in to the compute node by running:

run --pty --jobid 12345 /bin/bash

and then run nvidia-smi.

• I expected nvidia-smi to return information about GPU usage.

• nvidia-smi returns no devices were found