RFDETR-Seg ONNX Export Failing

[taharh]

What does this PR do?

Fixes ONNX export for segmentation models.

Issues fixed:

1. Export failed with AttributeError: 'dict' object has no attribute 'shape' because pred_masks can be a dictionary (containing spatial_features, query_features, bias) rather than a tensor. Added a check to handle both cases in main.py and deploy/export.py.

2. Pinned onnx>=1.16.0,<1.20 in pyproject.toml to avoid compatibility issues with onnx_graphsurgeon (onnx 1.20+ removed float32_to_bfloat16).

Related Issue(s): Related to PR #578 and to Issue #580

Type of Change

• Bug fix (non-breaking change that fixes an issue)

Testing

• I have tested this change locally

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in hard-to-understand areas
• My changes generate no new warnings or errors
• I have updated the documentation accordingly (if applicable)

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 22%. Comparing base (35ac6ab) to head (1e0d31c).

❌ Your patch check has failed because the patch coverage (0%) is below the target coverage (95%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (22%) is below the target coverage (95%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@          Coverage Diff           @@
##           develop   #626   +/-   ##
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- Coverage       22%    22%   -0%     
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  Files           46     46           
  Lines         6182   6188    +6     
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  Hits          1343   1343           
- Misses        4839   4845    +6     

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[probicheaux]

lgtm!

[Borda]

Suggested change

	try:
	from rfdetr import RFDETRSegNano
	except ImportError:
	pytest.skip("rfdetr not installed")

what is the case this is missing?

[Borda]

Use rather a decorator pytest.mark.skipif(...)

[Borda]

Suggested change

	"onnx>=1.16.0,<1.20",
	"onnx>=1.16.0",

Won't it work with versions above 1.20?