check gpu in tensorflow

# For tensorflow 2:
print("Num GPUs Available: ", len(tf.config.list_physical_devices('GPU')))

# For tensorflow 1:
sess = tf.Session(config=tf.ConfigProto(log_device_placement=True))

tf.test.is_gpu_available(
  cuda_only=False, min_cuda_compute_capability=None
)

$ pip uninstall tensorflow
$ pip install tensorflow-gpu