Can you share what was the output of the Restore Checkpoint path?
Next check if your tmp_model_checkpoint is correctly recalled.
Next check if in exercise 5.1 Locate and read from the configuration file, the path to the .config file for ssd resnet 50 v1 640x640 is defined correctly
the defining path should be ‘/content/models/research/object_detection/configs/tf2/ssd_resnet50_v1_fpn_640x640_coco17_tpu-8.config’
Let me know if you didn’t resolve the issue, you can DM me your notebook with name as MADivernois Copy of assignment. Click on my name and then message. Do not post codes on the public post thread, it is against community guidelines.
Regards
DP