One of the most common things as a datascientist we do is watching nvidia-smi , to look at our GPU utilization, memory etc.
Simply running nvidia-smi will give the GPU and memory utilization at a particular time only.
In order to run it across a period of time, so you don't want to repeat yourself you can use the command:
nvidia-smi -l 1
watch -n0.1 nvidia-smi