ModuleNotFoundError: No module named 're3'

how to solve this? any steps to follow? I followed this link https://gitlab.com/danielgordon10/re3-tensorflow

This is the error what I get.

Traceback (most recent call last): File "./demo/image_demo.py", line 9, in from tracker import re3_tracker File "/home/pkumars/re3-tensorflow-master/tracker/re3_tracker.py", line 12, in from re3 import network ModuleNotFoundError: No module named 're3'

Any help would make my life easier.