Update YOLOv5DatasetImporter to support loading list of .txt

[imyhxy]

What changes are proposed in this pull request?

Currently, the YOLOv5DatasetImporter does not support loading a split contains list of .txt, e.g.:

...
val:
  - one.txt
  - two.txt
  - three.txt
...

And, I make it support.

How is this patch tested? If it is not, please explain why.

I have tested the following variants of YOLOv5 dataset:

• Single folder as a split.
• Single txt as a split.
• Multiple folder as a split.
• Multiple txt as a split.
• Multiple mixed folder and txt as a split.

Release Notes

Is this a user-facing change that should be mentioned in the release notes?

• No. You can skip the rest of this section.
• Yes. Give a description of this change to be included in the release
  notes for FiftyOne users.

(Details in 1-2 sentences. You can just refer to another PR with a description
if this PR is part of a larger change.)

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

Summary by CodeRabbit

• New Features
  • Improved handling of dataset paths, allowing for multiple split paths to be processed.
  • Enhanced flexibility in managing various input formats for image paths.
• Bug Fixes
  • Streamlined control flow for evaluating image paths, ensuring consistent processing of all provided paths.
• Refactor
  • Simplified and clarified the structure of the code for better maintainability and readability.

[coderabbitai]

Walkthrough

The changes enhance the setup method in the fiftyone/utils/yolo.py file by improving the handling of dataset paths and split information. The implementation now accommodates multiple split paths and refactors the image path processing logic for consistency. The overall structure of the code is more streamlined, with clearer separation of concerns.

Changes

Files	Change Summary
fiftyone/utils/yolo.py	Modified the setup method to handle multiple split paths and refactored image path processing logic.

Poem

🐇 In the meadow where changes bloom,
A rabbit hops, dispelling gloom.
With paths now clear and splits in tow,
We dance with joy, our dataset's glow!
Hooray for code, so bright and neat,
In the world of YOLO, we hop to the beat! 🌼

---

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[coderabbitai]

Actionable comments posted: 1

Review details

Configuration used: .coderabbit.yaml
Review profile: CHILL

Commits

Files that changed from the base of the PR and between e8ec301 and 14dfedf.

Files selected for processing (1)

• fiftyone/utils/yolo.py (1 hunks)

[brimoor]

LGTM, thanks!

[brimoor]

FYI we already have tests that cover quite a few aspects of YOLOv5 import/export here:

fiftyone/tests/unittests/import_export_tests.py

Line 1646 in e8ec301

def test_yolov5_dataset(self):

[imyhxy]

LGTM, thanks!

You're welcome. You guys built such a great library.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.12%. Comparing base (8b225c4) to head (14dfedf).
Report is 747 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4742      +/-   ##
===========================================
- Coverage    99.27%   99.12%   -0.16%     
===========================================
  Files           47       49       +2     
  Lines        16212    16642     +430     
===========================================
+ Hits         16095    16496     +401     
- Misses         117      146      +29     

Flag	Coverage Δ
python	99.12% <ø> (-0.16%)	⬇️

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