how toknow tensoflow is using gpu code example

Example 1: tensorflow check gpu

tf.config.list_physical_devices('GPU')

Example 2: python check my gpu

from tensorflow.python.client import device_lib

def get_available_gpus():
    local_device_protos = device_lib.list_local_devices()
    return [x.name for x in local_device_protos if x.device_type == 'GPU']