Update lora_train.sh

ptuning/lora_train.sh

 export CUDA_VISIBLE_DEVICES=1,2,3,4
 deepspeed main.py \
-    --deepspeed deepspeed.json \
+    --deepspeed deepspeed_zero2.json \
     --do_train \
     --train_file AdvertiseGen/train.json \
     --validation_file AdvertiseGen/dev.json \