<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_mem(device_handle):
 """Get GPU device memory consumption in percent."""

    try:
        memory_info = pynvml.nvmlDeviceGetMemoryInfo(device_handle)
        return memory_info.used * 100.0 / memory_info.total
    except pynvml.NVMLError:
        return None