paddledetection断点恢复训练时未能加载相关参数

[HRyixin]

问题确认 Search before asking

• 我已经查询历史issue，没有发现相似的bug。I have searched the issues and found no similar bug report.

Bug组件 Bug Component

Training

Bug描述 Describe the Bug

ValueError: Model pretrain path /root/output/epoch_104.pdparams does not exists.

复现环境 Environment

训练语句
python -u /root/autodl-tmp/paddlepaddle/PaddleDetection/tools/train.py -c /root/autodl-tmp/paddlepaddle/PaddleDetection/configs/yolov3/yolov3_darknet53_270e_voc.yml -r /root/output/104 --use_vdl=true --vdl_log_dir="/root/autodl-tmp/paddlepaddle/work/output/vdl_dir/scalar" --eval

看到有人说要写成/root/output/epoch_104，遂改，但找不到路径了，会自动加载一个pdparams的后缀，这样就不会加载pdopt文件了
python -u /root/autodl-tmp/paddlepaddle/PaddleDetection/tools/train.py -c /root/autodl-tmp/paddlepaddle/PaddleDetection/configs/yolov3/yolov3_darknet53_270e_voc.yml -r /root/output/epoch_104 --use_vdl=true --vdl_log_dir="/root/autodl-tmp/paddlepaddle/work/output/vdl_dir/scalar" --eval

Bug描述确认 Bug description confirmation

• 我确认已经提供了Bug复现步骤、代码改动说明、以及环境信息，确认问题是可以复现的。I confirm that the bug replication steps, code change instructions, and environment information have been provided, and the problem can be reproduced.

是否愿意提交PR？ Are you willing to submit a PR?

• 我愿意提交PR！I'd like to help by submitting a PR!

[HRyixin]

训练中止是因为系统更新了