Unable to create/update the checkpoints during training

Hi team,

1. The entire URL of the file you are using

https://github.com/tensorflow/models/blob/master/research/object_detection/configs/tf2/faster_rcnn_resnet101_v1_640x640_coco17_tpu-8.config

2. Describe the bug

I'm using the faster RCNN 640x640 model for object detection on a custom dataset. During the training, I see that the events file, events.out.tfevents.1598792593.Meghana.23775.1504.v2 inside thetrain directory is getting updated. But, the corresponding checkpoints are not created.

Refer to the screenshots for the timestamps

The checkpoints in the above screenshots refer to the restored checkpoints. Not the once created during the training process.
Also, I see no log messages stating that the checkpoints are being saved as in TF1

Versions:
OS: ubuntu
TF: 2.3.0
python: 3.8.3

Thank you,
Meghana