How to change digits default gpu number '0'?

[sexyHongGi]

When running, the digits process occupies the first gpu(gpu number '0')

How to change to another gpu(ex. 1,2,3,4)?

nvidia-smi

Fri Aug 28 16:07:45 2020
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.82 Driver Version: 440.82 CUDA Version: 10.2 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 TITAN Xp Off | 00000000:18:00.0 Off | N/A |
| 23% 32C P8 8W / 250W | 606MiB / 12196MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 1 TITAN Xp Off | 00000000:3B:00.0 Off | N/A |
| 23% 32C P8 9W / 250W | 10MiB / 12196MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 2 TITAN Xp Off | 00000000:5E:00.0 Off | N/A |
| 23% 34C P8 8W / 250W | 10MiB / 12196MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 3 TITAN Xp Off | 00000000:86:00.0 Off | N/A |
| 23% 39C P8 9W / 250W | 10MiB / 12196MiB | 0% Default |
+-------------------------------+----------------------+----------------------+
| 4 TITAN Xp Off | 00000000:D8:00.0 Off | N/A |
| 23% 36C P8 9W / 250W | 10MiB / 12196MiB | 0% Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 1208873 C python2 149MiB |
| 0 1209109 C python2 149MiB |
| 0 1209326 C python2 149MiB |
| 0 1209540 C python2 149MiB |
+-----------------------------------------------------------------------------+

ps -ef | grep 1208873

root 1208873 1208872 4 Aug19 ? 10:47:48 python2 -m digits
root 2798961 2720196 0 16:07 pts/3 00:00:00 grep --color=auto 1208873

Thank you!