Decoupling mmaction for action classification (MoviNet, X3D)

[wonjuleee]

Summary

Performance comparison of movinet and x3d on ucf_kinetics_5percent_small dataset.
The results are averaged over 5 different seeds.

develop	test/acc	export/acc
movinet	0.513235	0.495588
x3d	0.697059	0.679412

decouple	test/acc	export/acc
movinet	0.539706	0.532353
x3d	0.695588	0.698529

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have ran e2e tests and there is no issues.
• 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) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[sungchul2]

LGTM. Thanks for your hard work!

[eunwoosh]

Thanks for your work :) I left some comments. Please take a look.

[eunwoosh]

I add minor comments.

[eunwoosh]

LGTM. Thanks for applying my comments :)