ImportError: cannot import name 'string_int_label_map_pb2'

System information

• Have I written custom code (as opposed to using a stock example script provided in TensorFlow):
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Ubuntu 18.04 LTS
• Mobile device (e.g., Pixel 4, Samsung Galaxy 10) if the issue happens on mobile device:
• TensorFlow installed from (source or binary): pip3
• TensorFlow version (use command below): 2.1.0
• Python version:
• Bazel version (if compiling from source):
• GCC/Compiler version (if compiling from source):
• CUDA/cuDNN version:
• GPU model and memory:

Please provide the entire URL of the model you are using?

Describe the current behavior

Describe the expected behavior

Code to reproduce the issue
Provide a reproducible test case that is the bare minimum necessary to generate the problem. -->

Other info / logs
Traceback (most recent call last):
File "model_main.py", line 26, in
from object_detection import model_lib
File "/home/ayushman/Documents/Github/models/research/object_detection/model_lib.py", line 27, in
from object_detection import eval_util
File "/home/ayushman/Documents/Github/models/research/object_detection/eval_util.py", line 33, in
from object_detection.metrics import coco_evaluation
File "/home/ayushman/Documents/Github/models/research/object_detection/metrics/coco_evaluation.py", line 27, in
from object_detection.utils import object_detection_evaluation
File "/home/ayushman/Documents/Github/models/research/object_detection/utils/object_detection_evaluation.py", line 46, in
from object_detection.utils import label_map_util
File "/home/ayushman/Documents/Github/models/research/object_detection/utils/label_map_util.py", line 27, in
from object_detection.protos import string_int_label_map_pb2
ImportError: cannot import name 'string_int_label_map_pb2'