support vllm

Former-commit-id: 889f6e910e654d8ec3922c2185042d737ffbf1c3

examples/lora_single_gpu/README.md

@@ -1,5 +1,8 @@
 Usage:
 
-- `pretrain.sh`
-- `sft.sh` -> `reward.sh` -> `ppo.sh`
-- `sft.sh` -> `dpo.sh` -> `predict.sh`
+- `pretrain.sh`: do pre-train (optional)
+- `sft.sh`: do supervised fine-tune
+- `reward.sh`: do reward modeling (must after sft.sh)
+- `ppo.sh`: do PPO training (must after sft.sh and reward.sh)
+- `dpo.sh`: do DPO training (must after sft.sh)
+- `predict.sh`: do predict (must after sft.sh and dpo.sh)