Coco detection metrics in object detection tf v.2.2.0

Prerequisites

Please answer the following question for yourself before submitting an issue.

• I checked to make sure that this feature has not been requested already.

1. The entire URL of the file you are using

https://github.com/tensorflow/models/blob/master/research/object_detection/colab_tutorials/eager_few_shot_od_training_tf2_colab.ipynb

2. Describe the feature you request

I request the implementation of the coco_detection_metrics in the above colab.

3. Additional context

The new colab for few-shot-training you provide is a great improvement on how to easily use the OD api. Having the coco metrics other than only the loss would be great.

4. Are you willing to contribute it? (Yes or No)

No