Inference related problem

[LKY83]

Hey all, I am quite new to python, but I would still like to try and run the model.
I was stucked at the inference part, the instruction given seems like not supporting the powershell syntax interpretation.

run from models/

python3 -m official.projects.unified_detector.run_inference
--gin_file=official/projects/unified_detector/configs/gin_files/unified_detector_model.gin
--ckpt_path=
--img_file=
--output_path=/demo.jsonl
--vis_dir=

But I am getting the error below:
at Line:2 Characters:3

• --gin_file=official/projects/unified_detector/configs/gin_files/unifi ...
• ~
  '--' The operator is missing after the unary operator.
  at Line:2 Characters:3
• --gin_file=official/projects/unified_detector/configs/gin_files/unifi ...

Unexpected 'gin_file=official/projects/unified_detector/configs/gin_files/unified_detector_model.gin' vocabulary primitive in operation or statement.

I tried to open up the run.inference.py to change the related directory, but I am getting the error below:
from official.projects.unified_detector import external_configurables # pylint: disable=unused-import
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ModuleNotFoundError: No module named 'official'

Any help would be much appreciated, thanks in advanced !!!