To support Yolov8

[SidneyLann]

Description

extends YoloV5Translator to support Yolov8 for #2753

• If this change is a backward incompatible change, why must this change be made?
• Interesting edge cases to note here

[KexinFeng]

Hi Sidney,

Thanks for contributing this feature which has been called for by many people. But current the new translator is not fully tested. Could you share your code that utilizes this yolov8 translator? It can be similar to the code below.

examples/src/main/java/ai/djl/examples/inference/MaskDetection.java
examples/src/main/java/ai/djl/examples/inference/ObjectDetection.java

Then it will demonstrate how your yolov8 tranlator is called.

[codecov-commenter]

Codecov Report

Patch coverage: 54.60% and project coverage change: +0.05% 🎉

Comparison is base (bb5073f) 72.08% compared to head (8ea1f6c) 72.14%.
Report is 882 commits behind head on master.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2776      +/-   ##
============================================
+ Coverage     72.08%   72.14%   +0.05%     
- Complexity     5126     7089    +1963     
============================================
  Files           473      702     +229     
  Lines         21970    31570    +9600     
  Branches       2351     3267     +916     
============================================
+ Hits          15838    22777    +6939     
- Misses         4925     7239    +2314     
- Partials       1207     1554     +347     

Files Changed	Coverage Δ
api/src/main/java/ai/djl/modality/cv/Image.java	69.23% <ø> (-4.11%)	⬇️
...rc/main/java/ai/djl/modality/cv/MultiBoxPrior.java	76.00% <ø> (ø)
.../main/java/ai/djl/modality/cv/output/Landmark.java	100.00% <ø> (ø)
...djl/modality/cv/transform/RandomFlipLeftRight.java	25.00% <0.00%> (-25.00%)	⬇️
...djl/modality/cv/transform/RandomFlipTopBottom.java	25.00% <0.00%> (-25.00%)	⬇️
...i/djl/modality/cv/translator/BigGANTranslator.java	21.42% <0.00%> (-5.24%)	⬇️
.../modality/cv/translator/ImageFeatureExtractor.java	0.00% <0.00%> (ø)
.../ai/djl/modality/cv/translator/YoloTranslator.java	27.77% <0.00%> (+18.95%)	⬆️
...ain/java/ai/djl/modality/cv/util/NDImageUtils.java	67.10% <0.00%> (+7.89%)	⬆️
api/src/main/java/ai/djl/modality/nlp/Decoder.java	63.63% <ø> (ø)
... and 226 more

... and 372 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[SidneyLann]

Hi Sidney,

Thanks for contributing this feature which has been called for by many people. But current the new translator is not fully tested. Could you share your code that utilizes this yolov8 translator? It can be similar to the code below.

examples/src/main/java/ai/djl/examples/inference/MaskDetection.java examples/src/main/java/ai/djl/examples/inference/ObjectDetection.java

Then it will demonstrate how your yolov8 tranlator is called.

new commit is rejected. can't commit after All checks have passed?

[SidneyLann]

new commit is rejected. can't commit after All checks have passed?

[SidneyLann]

[SidneyLann]

You can merge this PR and I will do the example in another PR.

[KexinFeng]

Hi @SidneyLann , this rejection of commit is actually a very common issue at the beginning of using git. It's because there is some update commits at the remote repo (in this case the "formate" commits I made) that hasn't been fetched to the local before pushing the local to the remote. So just first update the local repo by git pull(which may require further conflict resolving) and then do git push, or do as what bing chat suggests:

git pull --rebase origin <name-of-the-remote-branch>

<name-of-the-remote-branch> = yolo8 in this case.

Then do git push origin <name-of-the-remote-branch> to update the remote repo.

The following is the search result of "rejected non-fast-forward"

[The “non-fast-forward” error in Git usually occurs when you try to push your local changes to a remote repository, but the current branch on your local repository is behind its remote counterpart] [This means that there have been changes on the remote repository that you haven’t incorporated into your local repository]
...

We are considering doing some optimizations on the function protected DetectedObjects processFromBoxOutput(NDList list) to reduce the number of calls of toFloat (since it involvs jni calls which is a little more expensive). So maybe let's add the example here, so that we can use it for that effiency optimization.