Update run.sh

run.sh

 # export GPU_FLUSH_ON_EXECUTION=1
 
-len=129
+len=33
 step=20
 
-for num in  2 4;do
+for num in  1 2 4;do
     torchrun --nproc_per_node=${num} sample_video.py \
         --video-size 1280 720 \
         --video-length ${len} \