Fix ultralytics

[kaixi-wang]

What changes are proposed in this pull request?

fixes array len

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

import fiftyone as fo
import fiftyone.zoo as foz
import fiftyone.utils.huggingface as fouh
from fiftyone import ViewField as F

dataset = fouh.load_from_hub(
    "Voxel51/VisDrone2019-DET",
    name="sahi-test",
    max_samples=25,
    overwrite=True
    )
dataset = fouh.load_from_hub(
    "Voxel51/VisDrone2019-DET",
    name="sahi-test",
    max_samples=25,
    overwrite=True
    )
model = foz.load_zoo_model(
    "yolov8l-coco-torch",
    device="cuda"
    )

dataset.apply_model(model, label_field="predictions")

above snippet no longer throws error

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

• Bug Fixes
  • Improved the clarity and performance of the track ID extraction process for non-tracked results.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes made in the fiftyone/utils/ultralytics.py file involve a simplification in the _extract_track_ids function. The approach for generating a list of None values when result.boxes.is_track is false has been streamlined by removing an unnecessary len() function call, enhancing the clarity of the code while retaining the original logic and functionality.

Changes

File	Change Summary
fiftyone/utils/ultralytics.py	Simplified the generation of a list of None values in _extract_track_ids by directly using result.boxes.conf.size(0) instead of len().

Poem

In the code where rabbits hop,
A simplification made the clutter stop.
No need for lengths, just a direct call,
Improving clarity, that's the goal for all!
With each small change, we leap with glee,
In the world of code, we're forever free! 🐇✨

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[swheaton]

dupe #4720