support batch infer in vllm

Former-commit-id: 1324d158f9

examples/train_full/llama3_full_predict.yaml

@@ -1,23 +0,0 @@
-### model
-model_name_or_path: saves/llama3-8b/full/sft
-
-### method
-stage: sft
-do_predict: true
-finetuning_type: full
-
-### dataset
-eval_dataset: identity,alpaca_en_demo
-template: llama3
-cutoff_len: 2048
-max_samples: 50
-overwrite_cache: true
-preprocessing_num_workers: 16
-
-### output
-output_dir: saves/llama3-8b/full/predict
-overwrite_output_dir: true
-
-### eval
-per_device_eval_batch_size: 1
-predict_with_generate: true