Action task supports multi GPU training

[eunwoosh]

Summary

This PR enables multi GPU training to action task.
Current multi GPU training needs to be refactored because code flow for multi GPU enablement in each tasks are all different.
I'll refactored it after this pr is merged and at that time I'll implement unit test for that.

How to test

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

[jaegukhyun]

LGTM!. Could you add multi gpu test for action detection?

[eunwoosh]

LGTM!. Could you add multi gpu test for action detection?

Thanks! it's not hard but my intention is adding as little as possible test to integration test to reduce test time.
Is it necessary to add test in detection task also? If yes, then I'll add it too.

[jaegukhyun]

LGTM!. Could you add multi gpu test for action detection?

Thanks! it's not hard but my intention is adding as little as possible test to integration test to reduce test time. Is it necessary to add test in detection task also? If yes, then I'll add it too.

It make sense to me. Could you add multi-gpu test for action classification and action detection in e2e tests?
I think at least e2e should check all TC

[eunwoosh]

It make sense to me. Could you add multi-gpu test for action classification and action detection in e2e tests? I think at least e2e should check all TC

I added it.

[goodsong81]

LGTM, but could you please fix one thing below?