在线评估，validate.py命令，指定ckpt权重文件参数错误

[renjian-china]

If this is your first time, please read our contributor guidelines: https://github.com/mindspore-lab/mindcv/blob/main/CONTRIBUTING.md

Describe the bug/ 问题描述 (Mandatory / 必填) A clear and concise description of what the bug is. ckpt_path 需要指向具体的ckpt文件，帮助文档描述错误，如下：

另外：ckpt_patch路径填写错误时，无错误信息提示，精度为0.001

• Hardware Environment(Ascend/GPU/CPU) / 硬件环境:

Please delete the backend not involved / 请删除不涉及的后端: /device ascend/GPU/CPU/kirin/等其他芯片

• Software Environment / 软件环境 (Mandatory / 必填): -- MindSpore version (e.g., 1.7.0.Bxxx) : -- Python version (e.g., Python 3.7.5) : -- OS platform and distribution (e.g., Linux Ubuntu 16.04): -- GCC/Compiler version (if compiled from source):

• Excute Mode / 执行模式 (Mandatory / 必填)(PyNative/Graph):

Please delete the mode not involved / 请删除不涉及的模式: /mode pynative /mode graph

To Reproduce / 重现步骤 (Mandatory / 必填) Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior / 预期结果 (Mandatory / 必填) A clear and concise description of what you expected to happen.

Screenshots/ 日志 / 截图 (Mandatory / 必填) If applicable, add screenshots to help explain your problem.

Additional context / 备注 (Optional / 选填) Add any other context about the problem here.