FasterRCNN与MaskRCNN总的评估报告建议输出到文件中；现在仅调用了coco_eval函数，未处理该函数返回结果

| name       | about	                             | labels   |
| ---------- | ------------------------------------- | -------- |
| Bug Report | Use this template for reporting a bug | kind/bug |

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## Environment
- **Hardware Environment(`Ascend`/`GPU`/`CPU`)**: 
> Uncomment only one ` /device <>` line, hit enter to put that in a new line, and remove leading whitespaces from that line:
>
> /device ascend
> /device gpu
> /device cpu

- **Software Environment**:
-- MindSpore version (source or binary):
-- 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):

## Related testcase

## Steps to reproduce the issue
1. 
2. 
3.

## Describe the current behavior

## Describe the expected behavior

## Related log / screenshot

## Special notes for this issue

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