【tools】记录脚本运行时间

echo -n "start time  " > time
date >> time

python3 main.py 
        --batch-size=64 
        --arch=resnet50 
        --workers 6 
        --epochs=1 
        --gpu=0 
        /root/Data/ImageNet-pytorch/

echo -n "end time  " >> time ; date >> time
cat time >> log