Segmentation refactoring

[JihwanEom]

Summary

Apply the changes in that PR (#1955, Detection task refactoring) to the segmentation.

Experiments

Dataset: kvasir-seg train/val 300 imgs subset, lite-hrnet-18-mod-2, seed=0, deterministic=True
# Before refactoring
Performance: 0.7979 mDice, 251sec.
# After refactoring
Performance: 0.8093 mDice, 246sec.

• Unit-Test
  

• Integration Test (segmentation)
  

• E2E Test (segmentation): Same issue as detection -> will be explored together
  
  -> Fixed by @jaegukhyun
  

How to test

pytest -s -v tests/integration/cli/segmentation
pytest -s -v tests/e2e/cli/segmentation

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added e2e tests for validation.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[harimkang]

What a good progress in a short time! I left a few comments.

[supersoob]

Thanks for your hard work. I commented some.

[jaegukhyun]

I left some comments, could you check them?

[jaegukhyun]

Thank you for your effort! LGTM

[supersoob]

Great work